1/20 ÷ 5 could someone answer this

Answers

Answer 1

The value of the expression is 1/100.

We have,

To solve this expression, we can use the division property of fractions which states that dividing by a fraction is the same as multiplying by its reciprocal.

So, we have:

1/20 ÷ 5

= 1/20 x 1/5  (reciprocal of 5 is 1/5)

= 1/100   (multiply numerator with numerator and denominator with denominator)

Therefore,

The simplified result is 1/100.

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Related Questions

Use
the given data to construct a confidence interval of the population
portion that requested level X=70 n=125 confidence level 98%

Answers

A 98% confidence interval for the population proportion that requested level X=70 with n=125 is (0.456, 0.664).

Using the given data, we can calculate the sample proportion as

p-hat = X/n = 70/125 = 0.56

To construct a confidence interval for the population proportion, we can use the formula

p-hat ± z√(p-hat(1-p-hat)/n)

where z is the z-score corresponding to the desired confidence level. For a 98% confidence level, the z-score is approximately 2.33.

Plugging in the values, we get

0.56 ± 2.33√(0.56(1-0.56)/125)

Simplifying, we get

0.56 ± 0.104

Therefore, the 98% confidence interval for the population proportion is (0.456, 0.664).

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8.) Jordan needs to save at least $150 to ride the
bus to his grandparent's home. If he saves $12 a
week, what is the least number of weeks he
needs to save?

Answers

Answer:

[tex]12w \geqslant 150[/tex]

[tex]w \geqslant 12.5[/tex]

So Jordan needs to save $12 a week for at least 13 consecutive weeks.

During the spring of 2020, the state of Indiana was on lock down orders due to COVID-19. The state's business sales dropped exponentially and are modeled after the following equation:
Sales = 500 (1 - 0.10)^t
where t = number of days and sales = number of millions of dollars.
When sales have reached $23.5 million, it will be declared a statewide economic crisis. How many days until sales reach the economic crisis?

Answers

The sales of Indiana's businesses during the spring of 2020 are modeled by the equation Sales = 500(1-0.10)^t, where t is the number of days and sales are in millions of dollars. If sales reach $23.5 million, it will be considered a statewide economic crisis.

To solve the problem, we need to use the given equation and substitute the value of sales ($23.5 million) into it. Then we can solve for the value of t, which represents the number of days until sales reach the economic crisis.

500(1-0.10)^t = 23.5

(1-0.10)^t = 0.047

Taking the natural logarithm of both sides,

ln[(1-0.10)^t] = ln(0.047)

t ln(0.90) = -3.057

t = -3.057 / ln(0.90)

Using a calculator, we can evaluate the right-hand side of the equation to get t ≈ 37.28 days.

Therefore, it will take approximately 37.28 days for the sales of Indiana's businesses to reach the economic crisis threshold of $23.5 million.

In summary, we used the given exponential equation to find the number of days until the sales of Indiana's businesses reach the economic crisis threshold of $23.5 million. By substituting the value of sales into the equation and solving for t, we found that it will take approximately 37.28 days for this critical point to be reached. This calculation highlights the impact of the COVID-19 pandemic on the state's economy and underscores the importance of economic stimulus measures during times of crisis.

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Felicia is installing the new carpet she buys a piece of carpet that is 5' long and 6' wide she cuts off an area of 8 ft² what is the area of the remaining piece of carpet

Answers

After purchasing a carpet that is 5 feet long and 6 feet wide, Felicia cut off a section of 8 square feet so the area of the remaining piece of carpet is 22 square feet.

To find the area of the remaining piece of carpet, we need to subtract the area that Felicia cut off from the total area of the carpet.

The total area of the carpet is the product of its length and width, which is:

5 feet x 6 feet = 30 square feet

Felicia cut off 8 square feet from the carpet, so the area of the remaining piece of carpet is:

30 square feet - 8 square feet = 22 square feet

Therefore, the area of the remaining piece of carpet is 22 square feet.

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Problem 1. (10 points] Solve the differential equation 2y2 cos xdx + (4 + 4y sin x)dy = 0. =

Answers

Answer:

To solve the differential equation 2y^2 cos(x)dx + (4 + 4y sin(x))dy = 0, we can use the method of integrating factors.

First, we can rearrange the equation as:

2y^2 cos(x)dx = - (4 + 4y sin(x))dy

Dividing both sides by y^2(4 + 4sin(x)), we get:

-2cos(x)/y^2 dx + (1 + sin(x))/y dy = 0

Now we can identify the coefficients of dx and dy as -2cos(x)/y^2 and (1 + sin(x))/y, respectively.

To find the integrating factor, we can use the formula:

μ(x) = exp[∫P(x)dx]

where P(x) is the coefficient of dx. In this case, we have:

P(x) = -2cos(x)/y^2

So we need to integrate P(x) with respect to x:

∫P(x)dx = -2∫cos(x)/y^2 dx = 2sin(x)/y^2 + C

where C is an arbitrary constant.

Therefore, the integrating factor is:

μ(x) = exp[2sin(x)/y^2 + C]

Multiplying both sides of the differential equation by the integrating factor, we get:

-2cos(x) exp[2sin(x)/y^2 + C] dx/y^2 + (1 + sin(x)) exp[2sin(x)/y^2 + C] dy/y = 0

Now we can rewrite this equation as a total derivative:

d/dx [exp[2sin(x)/y^2 + C]/y] = 0

Integrating both sides with respect to x, we get:

exp[2sin(x)/y^2 + C]/y = D

where D is a constant of integration.

Solving for y, we get:

y = sqrt[2sin(x)/(D - exp[2sin(x)/y^2 + C])]

This is the general solution to the differential equation. The constant D and C can be determined from initial or boundary conditions, if given.

The general solution to the differential equation is:

-y^2 ln|4 + 4y sin(x)| = y + C

where C = C1 + C2.

To solve the differential equation 2y^2cos(x)dx + (4 + 4y sin(x))dy = 0, we first need to check whether it is a homogeneous equation or not. A homogeneous equation is one where all the terms have the same degree. In this case, we have a term with x and a term with y, so it is not homogeneous.

Next, we can check whether it is a separable equation or not. A separable equation is one where we can write it in the form f(x)dx = g(y)dy. We can rearrange the equation as:

2y^2cos(x)dx = - (4 + 4y sin(x))dy

Dividing both sides by (4 + 4y sin(x)) and rearranging, we get:

-2y^2cos(x) / (4 + 4y sin(x)) dx = dy

Now, we can integrate both sides with respect to their respective variables:

∫ -2y^2cos(x) / (4 + 4y sin(x)) dx = ∫ dy

To solve the integral on the left-hand side, we can use the substitution u = 4 + 4y sin(x), which gives du/dx = 4y cos(x) and du = 4y cos(x)dx. Substituting this into the integral, we get:

∫ -y^2 / u du = -y^2 ln|u| + C1

Substituting back u = 4 + 4y sin(x), we get:

∫ -y^2 / (4 + 4y sin(x)) du = -y^2 ln|4 + 4y sin(x)| + C1

Integrating the right-hand side with respect to y, we get:

∫ dy = y + C2

Therefore, the general solution to the differential equation is:

-y^2 ln|4 + 4y sin(x)| = y + C

where C = C1 + C2.

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The method of tree-ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution. 1,285 1,194 1,299 1,180 1,268 1,316 1,275 1,317 1,275 (a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s.
(Round your answers to the nearest whole number.) x = 1268 Correct: Y
our answer is correct. A.D. s = 43 Incorrect: Your answer is incorrect. yr
(b) When finding an 90% confidence interval, what is the critical value for confidence level? (Give your answer to three decimal places.) tc = 1.860 Correct: Your answer is correct.
What is the maximal margin of error when finding a 90% confidence interval for the mean of all tree-ring dates from this archaeological site? (Round your answer to the nearest whole number.) E = :
Find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site. (Round your answers to the nearest whole number.) lower limit Incorrect: . A.D. upper limit Incorrect:

Answers

The 90% confidence interval for the mean of all tree-ring dates from this archaeological site is (1233, 1303) A.D. (rounded to nearest whole number).

To find the sample mean year x and sample standard deviation s, we can use the calculator's mean and standard deviation functions:

x = 1268 (rounded to nearest whole number)

s = 43 (rounded to nearest whole number)

To find the critical value for a 90% confidence interval, we can use a t-distribution with n-1 degrees of freedom (where n is the sample size). Since the sample size is not given, we'll assume it's 9 (the number of years listed in the data set). Using a t-table or calculator, the critical value for a 90% confidence interval with 8 degrees of freedom is approximately 1.860 (rounded to three decimal places).

The maximal margin of error for a 90% confidence interval can be found using the formula:

E = tc * s / sqrt(n)

where tc is the critical value, s is the sample standard deviation, and n is the sample size. Plugging in the values we have, we get:

E = 1.860 * 43 / sqrt(9) = 35.13 (rounded to nearest whole number)

To find the 90% confidence interval for the mean of all tree-ring dates from this archaeological site, we can use the formula:

(lower limit, upper limit) = (x - E, x + E)

Plugging in the values we have, we get:

(lower limit, upper limit) = (1268 - 35, 1268 + 35) = (1233, 1303)

So the 90% confidence interval for the mean of all tree-ring dates from this archaeological site is (1233, 1303) A.D. (rounded to nearest whole number).

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Select all the items on Conner's social media profile
that may give a criminal too much information.
1. Conner's birthday
2. A picture of Conner's dog
3. An image of Conner and his friends outside The Hub
4. Conner's nickname in his profile
5. A picture of Conner, Jake, and Nana

Answers

All the items on Conner's social media profile that may give a criminal too much information are:

1. Conner's birthday3. An image of Conner and his friends outside The Hub4. Conner's nickname in his profile

Why are these?

Exposing one's birthday might lead to identity theft since it is a private data that can be utilized by malicious individuals to acquire access to other crucial information.

While an image of Conner together with his buddies taken outside The Hub may look exciting and a great memory, it might reveal his position, making it simple for perpetrators to trail their movements and prey on them or their acquaintances.

Conner's username in his account is similarly critical; if it is exceptional and not extensively known, criminals can simulate him or deceptively target him through methods like social engineering tricks to attain his confidential details.

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Find the surface area of a regular hexagonal pyramid with side length = 8, and a slant height = 16. Round to the nearest tenth.
Answer Immediately

Answers

Answer:

To find the surface area of a regular hexagonal pyramid, we need to find the area of the six triangular faces and the area of the hexagonal base, and then add them together.

The area of each triangular face is given by the formula:

(1/2) x base x height

In this case, the base of each triangle is the side length of the hexagon (8), and the height is the slant height of the pyramid (16). Therefore, the area of each triangular face is:

(1/2) x 8 x 16 = 64

The hexagonal base can be divided into six equilateral triangles, each with side length 8. The area of each equilateral triangle is:

(1/4) x sqrt(3) x side length^2

Plugging in the values, we get:

(1/4) x sqrt(3) x 8^2 = 16sqrt(3)

To find the total surface area, we add the area of the six triangular faces and the area of the hexagonal base:

6 x 64 + 16sqrt(3) = 384 + 16sqrt(3)

Rounding to the nearest tenth, the surface area of the regular hexagonal pyramid is:

398.6 square units (rounded to one decimal place)


Cristobal is comparing the membership club fees at two different bookstores. At the first bookstore, it costs $24.27 annually to be a
member of the club, but he will save 15% on all his purchases. At the second bookstore, it costs $36.54 annually to be a member of
the club, but he will save 25% on all his purchases.
How much does Cristobal need to spend in a year for the membership at the second bookstore to be the better value?

Answers

Cristobal needs to spend more than $122.70 for the membership at the 2nd bookstore to be better value.

How much must Cristobal spend at second bookstore?

For first bookstore, as Cristobal pays $24.27 for an annual membership, save 15% on all his purchases, the amount he saves on purchases will be represented as 0.15x.

So total cost of being a member of the first bookstore is:

$24.27 + $0.15x.

For second bookstore, as Cristobal pays $36.54 for an annual membership, save 25% on all his purchases, the amount he saves on purchases will be represented as 0.25x.

So the total cost of being a member of the second bookstore is:

= $36.54 + $0.25x.

To determine when membership at second bookstore is better value, we must set total cost of second bookstore less than first bookstore and then, we will solve for x:

$36.54 + $0.25x < $24.27 + $0.15x

$12.27 < $0.10x

x > $122.70.

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a police officer is using a radar device to check motorists' speeds. prior to beginning the speed check, the officer estimates that 40 percent of motorists will be driving more than 5 miles per hour over the speed limit. assuming that the police officer's estimate is correct, what is the probability that among 4 randomly selected motorists, the officer will find at least one motorist driving more than 5 miles per hour over the speed limit (decimal to the nearest ten-thousandth.)

Answers

The probability that among 4 randomly selected motorists, the officer will find at least one motorist driving more than 5 miles per hour over the speed limit is 0.8704, rounded to the nearest ten-thousandth.

To solve this problem, we can use the complement rule, which states that the probability of an event happening is equal to 1 minus the probability of the event not happening.

First, let's find the probability that none of the 4 randomly selected motorists will be driving more than 5 miles per hour over the speed limit.

Since the officer estimates that 40% of motorists will be driving more than 5 miles per hour over the speed limit, then the probability of a motorist not driving more than 5 miles per hour over the speed limit is 1 - 0.4 = 0.6.

The probability that none of the 4 motorists will be driving more than 5 miles per hour over the speed limit is therefore:

0.6 x 0.6 x 0.6 x 0.6 = 0.1296

Now we can use the complement rule to find the probability that at least one of the 4 motorists will be driving more than 5 miles per hour over the speed limit:

1 - 0.1296 = 0.8704

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At a large company banquet for several thousand employees and their families, many of the attendees became ill the next day. The company doctor suspects that the illness may be related to the fish, one of three options for the main course. Because all the dinner guests had to preorder their meal, the doctor was able to randomly select and contact 80 people that ate the fish, of which 64 people got sick. The doctor also randomly selected (and contacted) 60 people that did not eat the fish, of which 39 people got sick. The doctor also knows that at least 1000 attendees ordered the fish.
(a) Is this convincing evidence that the true proportion of all attendees who ate the fish that got sick is more than the true proportion of all attendees who did not eat the fish that got sick?

Answers

Part A: The given evidence is convincing to provide the true proportion regarding the attendees.

Part B: The error is a type 1 error in the hypothesis testing.

Type 1 Error and Type 2 Error

A type 1 error in hypothesis testing occurs when a null hypothesis is rejected when it is true.

A type II error in hypothesis testing occurs when the investigator fails to reject the null hypothesis that is actually false.  

Given that,

the total number of attendees who ordered fish is 1000.

And, The random selection for the sample size of the attendees who ate fish is 80 of which 64 people got sick.

Hence, The number of attendees who ate the fish and got sick is calculated as given below.

No. of attendees = 64/80

% of No. of attendees = 64/80 x 100

% of No. of attendees = 80%

The random selection for the sample size of the attendees who did not eat fish is 60 of which 39 people got sick.

The number of attendees who did not eat the fish and got sick is calculated as given below.

No. of attendees  = 39/60

% of No. of attendees = 39/60 x 100

% of No. of attendees = 65%

Hence, For Part A;

The given evidence is convincing to provide the true proportion of all attendees who ate the fish that got sick is more than the true proportion of all attendees who did not eat the fish that got sick.

For Part B;

The mistake here is that the doctor's theory (hypothesis) got rejected regarding the number of attendees who ate the fish got sick than those who did not eat the fish.

This error is a type 1 error in the hypothesis testing.

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Your CD player is set for random play. There are 20 CDs in the player and
there are 10 songs on each CD. You have one favorite song on each of the
CDs. What is the probability that the next song played is one of them?

Answers

the probability that the next song played is one of the favorite songs is 0.1 or 10%.

Since there are 20 CDs with 10 songs each, there are a total of 20 x 10 = 200 songs in the player.

Since there is one favorite song on each CD, there are a total of 20 favorite songs in the player.

The probability of the next song played being one of the favorite songs is equal to the number of favorite songs divided by the total number of songs in the player:

Probability = Number of favorite songs / Total number of songs

Probability = 20 / 200

Probability = 0.1

Therefore, the probability that the next song played is one of the favorite songs is 0.1 or 10%.

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for what real values of $c$ is $x^2 16x c$ the square of a binomial? if you find more than one, then list your values separated by commas.

Answers

The real values of $c$ for which $x^2 + 16x + c$ is the square of a binomial are $64$ and $0$.

To find these values, we can use the concept of completing the square. For a quadratic expression to be the square of a binomial, the coefficient of the linear term ($16x$) must be twice the product of the square root of the constant term ($c$) and the square root of the coefficient of the quadratic term ($1$). In this case, the coefficient of the linear term is $16$ and the coefficient of the quadratic term is $1$. So, we have $16 = 2\sqrt{c}\sqrt{1}$.

Simplifying this equation gives $16 = 2\sqrt{c}$. Dividing both sides by $2$ yields $\sqrt{c} = 8$. Squaring both sides gives $c = 64$. Thus, $c = 64$ is one possible value.

Additionally, if we consider the case when $c = 0$, the quadratic expression becomes $x^2 + 16x + 0 = (x + 8)^2$. Therefore, $c = 0$ is another possible value.

In summary, the real values of $c$ for which $x^2 + 16x + c$ is the square of a binomial are $64$ and $0$.

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Review Worksheet:
Using the IVT and the function f(x)=x²-2x-2, on what interval can you say will there definitely be a zero?

Answers

Since f(-1) is positive and f(3) is negative, by the IVT, we can conclude that there is at least one zero of the function on the interval [-1, 3]. Therefore, we can say with certainty that there is definitely a zero of f(x) = x² - 2x - 2 on the interval [-1, 3].

To use the IVT to determine an interval where there definitely is a zero of the function f(x) = x² - 2x - 2, we need to evaluate the function at the endpoints of an interval and determine whether the function changes sign over that interval.

Let's consider the interval [-2, 3] as an example. Evaluating f(-2) and f(3), we get:

f(-2) = (-2)² - 2(-2) - 2

= 4 + 4 - 2

= 6

f(3) = 3² - 2(3) - 2

= 9 - 6 - 2

= 1

Since f(-2) is positive and f(3) is positive as well, we cannot use the IVT to conclude that there is a zero of the function on the interval [-2, 3].

However, we can try another interval. Let's try the interval [-1, 3]. Evaluating f(-1) and f(3), we get:

f(-1) = (-1)² - 2(-1) - 2

= 1 + 2 - 2

= 1

f(3) = 3² - 2(3) - 2

= 9 - 6 - 2

= 1

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F-Ready
Number of Solutions for Linear Equations-Instruction-Level H
Not all equations have exactly one solution. Consider the equation 2n +6=2(3+n).
Can you find more solutions? Complete the rest of the table.
n
0
1 ?.
2
3
?
?
Solution?
solution
4

Answers

The solutions to the equation 2n +6=2(3+n) is infinite many

Finding the solutions to the equation

From the question, we have the following parameters that can be used in our computation:

2n +6=2(3+n).

Open the brackets

So, we have

2n + 6 = 2n + 6

Evaluate the like terms

0 = 0

This means that the equation has infinite many solutions

Can you find more solutions?

Yes, this is because any real value can be used for n

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Use the figure to find the radius.



4
4√2
4√3

Answers

The radius of the figure is 2√2.

We have,

From the figure,

The right angle triangle.

One angle is 90 and the other two angles will be the same. ie. 45

Now,

The sides opposite to the equal angles are the same.

From the figure,

Side = 2

Now,

Applying the Pythagorean theorem,

radius² = side² + side²

radius² = 2² + 2²

radius² = 4 + 4

radius = √8 = 2√2

Thus,

The radius of the figure is 2√2.

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Let U be a nonempty open subset of RP. Let a EU. Let F (f1,..., fa): U ŹR9 be a function that is differentiable at a. Let A : RP → R9 be any affine function for which A(a) = F(a) and dA(a) = dF(a). = Prove that A(-) = F(a + dF(a(-). Remark 1. The results in A1, A2, and A3 are higher-dimensional analogues of familiar facts from Calculus I. It is a good idea to think about these problems in the special Calculus I case of p=1= q: doing so may deepen your understanding and may help you solve these problems if you are experiencing difficulties. =

Answers

We have shown that A(-) = F(a + dF(a(-)), as required.

To prove that A(-) = F(a + dF(a(-)), we need to show that the affine function A coincides with the function F at every point x in RP.

Let x be an arbitrary point in RP. We can write x = a + t, where t is a vector in the tangent space of RP at a. Since U is open in RP, we can choose a small enough neighborhood of a in U such that a + t is also in U.

Since F is differentiable at a, we can apply the multivariable chain rule to get:

dF(a + t) = dF(a) + J(a)t + o(||t||)

where J(a) is the Jacobian matrix of F at a, and o(||t||) is a term that goes to zero faster than ||t|| as t approaches zero.

Since A is affine, we can write:

A(x) = A(a + t) = A(a) + Bt

where B is a constant matrix. Since A(a) = F(a) and dA(a) = dF(a), we have:

A(x) = F(a) + dF(a)t + o(||t||)

Comparing the two expressions for A(x), we see that we can choose B = dF(a) and the remainder term o(||t||) is the same in both expressions. Therefore:

A(x) = F(a) + dF(a)t + o(||t||) = F(a + t) + o(||t||) = F(x) + o(||t||)

Since o(||t||) goes to zero faster than ||t|| as t approaches zero, we have:

A(x) = F(x)

for all x in RP. Therefore, we have shown that A(-) = F(a + dF(a(-)), as required.

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Which statement is true about scalene triangles?

A.
a triangle with at least two equal sides

B.
a triangle that has three acute angles

C.
a triangle with no sides that are the same length

D.
a triangle with three sides that are the same length

Answers

Answer: :)

The correct answer is C. A scalene triangle is a triangle with no sides that are the same length. This means that all three sides of a scalene triangle have different lengths. In addition, a scalene triangle does not have any angles that are congruent. This is in contrast to an isosceles triangle, which has two sides of equal length, and an equilateral triangle, which has all three sides of equal length.

Step-by-step explanation:

According to a recent survey conducted in 2016,
about 69.7% of high school graduates at least enroll
in some type of college by age 24.
Using the parameters provided, if 162 students
graduated from a high school what is the probability
that 100 or less would enroll in college at some point
by age 24? (CDF)

Answers

The probability that 100 or less students enroll in college at some point by age 24 would be c. 97.8%

How to find the probability ?

The binomial cumulative distribution function (CDF) can be utilized to tackle this issue. The situation fits the characteristics of a binomial distribution, which comes into play when there are 'n' fixed trials in total, with only two possible outcomes - either success or failure.

Furthermore, constant probability of attaining success (p) persists through every individual trial.

The formula is:

P ( X ≤ 100 ) = ∑ [ C ( n , k ) x p^ k x q ^ ( n - k ) ] for k = 0 to 100

Using a binomial calculator, we find out that:

P ( X ≤ 100 ) = 0. 978 or 97. 8 %

In conclusion, option C is correct.

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Right triangle. Find the exact values of x and y.​

Answers

Answer:

x = [tex]\sqrt{51}[/tex] , y = 7

Step-by-step explanation:

since PA is a tangent, then angle between tangent and radius at point of contact A is 90°

the triangle with radius x is right.

using Pythagoras' identity in the right triangle

x² + 7² = 10²

x² + 49 = 100 ( subtract 49 from both sides )

x² = 51 ( take square root of both sides )

x = [tex]\sqrt{51}[/tex]

since PB is a tangent then ∠ B = 90° and triangle with y is right

note that the segment from B to the centre is the radius and is equal to x

using Pythagoras' identity in this right triangle

y² + x² = 10²

y² + ([tex]\sqrt{51}[/tex] )² = 100

y² + 51 = 100 ( subtract 51 from both sides )

y² = 49 ( take square root of both sides )

y = [tex]\sqrt{49}[/tex] = 7

then x = [tex]\sqrt{51}[/tex] and x = 7

please help thank you​

Answers

First find the area of the triangle: base multiply by heigh divided by 2:
B•H/2
= 12•12/2
=72m^2

Now find he area of the rectangle: base multiplied by height
B•H
= 9•3
= 27m^2

Lastly subtract the area of the rectangle to find the area of the shaded parts of the triangle.

= 72-27
= 45m^2

Therefore the area of the shaded part of the triangle is 45 meters squared.

We would like to use distance-weighted 2-nearest neighbors to approximate the function f(x) = 8x - 10 – x2 given the data instances (x, f(x)): (1.0,-3.0), (3.0, 5.0), (5.0, 5.0), (7.0,-3.0). What is the value x = Xo at which the maximum error (ie f(x)-f(x)) is made in the approximation of f(x) in the region 3 SXS 5 if we use distance-weighted 2-nearest neighbors? Would the error at Xo increase or decrease if we use 4-nearest neighbors with the given data? [5 Marks)

Answers

It would also increase the computational complexity of the algorithm.

To use distance-weighted 2-nearest neighbors, we need to find the two nearest neighbors to a given point, weight them by their distances from the point, and then use their weighted average to approximate the function at that point. For the region 3 ≤ x ≤ 5, the two nearest neighbors to any point x would be (3.0, 5.0) and (5.0, 5.0).

The distance-weighted average approximation of f(x) in this region is:

f(x) ≈ (w1f(3) + w2f(5)) / (w1 + w2)

where w1 and w2 are the weights given to the two nearest neighbors, which are inversely proportional to their distances from x:

w1 = 1 / |x - 3.0|^2

w2 = 1 / |x - 5.0|^2

Substituting in the given values, we get:

f(x) ≈ [(1/|x-3.0|^2)*5.0 + (1/|x-5.0|^2)*5.0] / [(1/|x-3.0|^2) + (1/|x-5.0|^2)]

To find the value x = Xo at which the maximum error is made, we need to find the value of x in the region 3 ≤ x ≤ 5 that maximizes the absolute difference between f(x) and f(x). We can do this by taking the derivative of the absolute difference with respect to x and setting it equal to zero:

d/dx |f(x) - f(x)| = d/dx |8x - 10 - x^2 - f(x)| = 0

Solving for x, we get:

x = 3.8 or x = 4.2

To determine which of these values of x gives the maximum error, we can simply evaluate |f(x) - f(x)| at each point:

|x=3.8| = |(1/0.04)*3.0 + (1/0.04)5.0 - (1/0.16)(-1.24)| = 10.74

|x=4.2| = |(1/0.04)*5.0 + (1/0.04)5.0 - (1/0.04)(-3.56)| = 13.96

Therefore, the maximum error occurs at x = 4.2, where the absolute difference between the actual function value and the distance-weighted 2-nearest neighbor approximation is 13.96.

If we use distance-weighted 4-nearest neighbors instead, we would use the four nearest neighbors to each point, weight them by their distances, and then take their weighted average. This would likely reduce the error at x = Xo, since using more neighbors reduces the influence of any single neighbor on the approximation. However, it would also increase the computational complexity of the algorithm.

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You are standing 450 feet away from the skyscraper that is 700 feet tall. What is the angle of elevation from You to the top of the skyscraper

Answers

Answer:

The angle of elevation from you to the top of the skyscraper is approximately 56.2 degrees.

Step-by-step explanation:

A circle is painted in the center of a basketball court. If the diameter of the circle is 12 feet, what is the approximate amount of space inside of the circle? (Use 3. 14 as an approximation of pi. )

Answers

The approximate amount of area in the circle is 113.04 square feet.

The area of a circle is given through the expression [tex]A = \pi r^2[/tex], in which π is about equal to 3.14, and r is the radius of the circle.

In this instance, we are given the diameter of the circle, that is 12 feet. The radius of the circle is half of the periphery, so the radius is

r = 12 / 2 = 6 feet

Now, we're suitable to use the methodology for the area of a circle to discover the approximate amount of space within the circle

[tex]A = \pi r^2 = 3.14 * 6^2 = 3.14 * 36 \approx 113.04[/tex] square feet[tex]A = \pi r^2[/tex]

Accordingly, the approximate amount of area in the circle is 113.04 square feet.

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The scatter plot represents the average daytime temperatures recorded in New York for a week. What is the range of the temperature data in degrees Fahrenheit?

Answers

The range of the temperature data in degrees Fahrenheit is 15.

Option A is the correct answer.

We have,

From the scatterplot,

The highest average temperature = 45

The lowest temperature = 30

Now,

Range.

= Highest temperature - Lowest temperature

= 45 - 30

= 15

Thus,

The range of the temperature data in degrees Fahrenheit is 15.

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The box plot displays the number of flowers planted in a town last summer.

A box plot uses a number line from 3 to 31 with tick marks every one-half unit. The box extends from 10 to 18 on the number line. A line in the box is at 12. The lines outside the box end at 4 and 30. The graph is titled Flowers Planted In Town, and the line is labeled Number of Flowers.

Which of the following is the best measure of center for the data shown, and what is that value?

The median is the best measure of center and equals 12.
The median is the best measure of center and equals 14.
The mean is the best measure of center and equals 12.
The mean is the best measure of center and equals 14.

Answers

According to the information presented on the box plot:

The median is the best measure of center and equals 12.

How to get the median

The box plot illustrates a rectangular shape extending from the numerical values of 10 to 18 on a number line, where an inner line rests at the numerical value of 12 within the confines of the rectangle.

The median functions as the numeric value that effectively splits data in half, equally distributing percentages of 50% below and above it while defining its centrality.

In this case, the statement "A line in the box is at 12" defines the median.

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Which value is in the domain of f(x)?

The Answer is C

Answers

A value which is in the domain of f(x) include the following: C. 4.

What is a piecewise-defined function?

In Mathematics, a piecewise-defined function is a type of function that is defined by two (2) or more mathematical expressions over a specific domain.

Generally speaking, the domain of any piecewise-defined function simply refers to the union of all of its sub-domains. By critically observing the given piecewise-defined function, we can reasonably infer and logically deduce that it is defined over the interval -6 < x ≤ 0 and 0 < x ≤ 4.

In conclusion, a value of 4 is the only answer option that is in the domain of this piecewise-defined function.

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Complete Question:

Which value is in the domain of f(x)?

A.) –7

B.) –6

C.) 4

D.) 5

What is the surface area of the entire prism below?
Area of triangle = 1/2bh
Area of rectangle = L * W
5 ft
4 ft
6 ft
5 ft
18 ft

Answers

The Total surface area of the given prism is: 312 ft²

What is the surface area of the prism?

The formula for the areas of the shapes that make up the triangular prism are:

Area of triangle = ¹/₂bh

where:

b is base

h is height

Area of rectangle = L * W

where:

L is length

W is width

Thus:

Total surface area = 2(¹/₂ * 6 * 4) + 2(5 * 18) + (18 * 6)

Total surface area = 24 + 180 + 108

Total surface area = 312 ft²

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What is the value of h?
Opposite=15cm
Sin(31°
Give your answer correct to one decimal place.

Answers

Using SOH CAH TOA, the value of hypotenuse, h, is 29.1 cm

Trigonometry: Calculating the value of the hypotenuse

From the question, we are to calculate the value of the hypotenuse.

In the diagram, h represents the hypotenuse

Using SOH CAH TOA

sin (angle) = Opposite / Hypotenuse

cos (angle) = Adjacent / Hypotenuse

tan (angle) = Opposite / Adjacent

From the given information,

Angle = 31°

Opposite = 15 cm

Hypotenuse = h

Thus,

sin (31°) = 15 cm / h

0.515038 = 15 cm / h

Then,

h = 15 / 0.515038 cm

h = 29.12406 cm

h ≈ 29.1 cm

Hence,

The value of h is 29.1 cm

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how any units are in math

Answers

Answer:

Math is a broad field that encompasses several branches, each with its own units of measurement. Some examples of units in math include:

In geometry:- Units of length, such as meters, centimeters, and inches

Units of area, such as square meters, square centimeters, and square feet

Units of volume, such as cubic meters, cubic centimeters, and cubic feet- Units of weight or mass, such as kilograms, grams, and pounds - Units of time, such as seconds, minutes, and hours

Units of temperature, such as Celsius and

Fahrenheit

Units of angle measurement, such as degrees and radians

Units of speed or velocity, such as meters per second or miles per hour

Units of frequency, such as Hertz or cycles per second

Units of energy or work, such as joules, calories, and foot-pounds

Units of power, such as watts and horsepower

These are just a few examples of the many units used in math. The type of unit used depends on the specific problem or application.

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