CMS District Screener for Math 1 / 4 of 20



Il Pause



Help -



A business has a savings account that earns a 3% annual interest rate. At the end of 1996, the business had $4,000 in the account. The



formula F



+



100 is used to determine the amount in the savings account.



P(1



• Fis the final amount,



p is the initial investment amount,
. Ris the annual interest rate, and
. Tis the time in years.



To the nearest dollar, how much did the business initially invest in 1991?



o A. $4,637



O B. $3,450



O C. $3,455



O D. $4,631

(a) There cannot exist such a polynomial f(x), and x is not a unit in F[x].

(b)  (i)  Every element in Q[x]/(x² – 3) can be written as a + bx + (x² – 3) for some a, b in Q.

(ii)This element indeed satisfies the requirement that (x + (x² – 3))·(x + (x² – 3))-2 = 1 + (x² – 3), and therefore acts like 1/(x + (x² – 3)) in Q[x]/(x² – 3).

(a) We know that the degree of any non-zero polynomial in F[x] is a non-negative integer. Therefore, for x to be a unit in F[x], there must exist a polynomial f(x) in F[x] such that x·f(x) = 1.

But then, the degree of the left-hand side is 1+deg(f(x)), which is greater than or equal to 1 (since deg(f(x)) is a non-negative integer), whereas the degree of the right-hand side is 0.

(b)

(i)This is because the elements of Q[x]/(x² – 3) are cosets of the form f(x) + (x² – 3), where f(x) is a polynomial in Q[x], and any polynomial in Q[x] can be written in the form a + bx + cx² + … + nx (where a, b, c, …, n are rational numbers) by the usual polynomial arithmetic operations of addition and multiplication.

(ii) We want to find (x + (x² – 3))-2. This means we want to find an element in Q[x]/(x² – 3) s

uch that, when multiplied by (x + (x² – 3)), gives us 1 + (x² – 3). In other words, we want to find an element that acts like 1/(x + (x² – 3)).

We can use the partial fraction decomposition to find such an element. Let's write 1 + (x² – 3) as a fraction:

1 + (x² – 3) = (4/3)·(x + √3)·(x – √3)/(x + (x² – 3)) + (2/3)·(x – √3)/(x + (x² – 3)) – (2/3)·(x + √3)/(x + (x² – 3))

Now, we can see that the coefficients of (x + (x² – 3)) in each term are the inverses of the elements we are looking for. Therefore:

(x + (x² – 3))-2 = (4/3)·(x + √3)·(x – √3) + (2/3)·(x – √3) – (2/3)·(x + √3)

To know more about partial fraction click on below link:

https://brainly.com/question/31224613#

#SPJ11

(a) The complementary solution, yc, for the associated homogeneous equation is yc(x) = C1e^(-3x) + C2e^(2x).

To find the complementary solution, we consider the homogeneous equation associated with the given differential equation, which is obtained by setting the right-hand side of the differential equation to zero. The general form of the complementary solution is in the form yc(x) = C1e^(r1x) + C2e^(r2x), where r1 and r2 are the roots of the characteristic equation. In this case, the characteristic equation is r^2 - 3r + 2 = 0, which has roots r1 = 1 and r2 = 2. Substituting these values into the general form gives us the complementary solution yc(x) = C1e^(-3x) + C2e^(2x).

(b) To find a particular solution, yp, using the method of undetermined coefficients, we assume that yp(x) has the form yp(x) = Ax + Be^(3x).

We assume that the particular solution has the same form as the non-homogeneous term, but with undetermined coefficients A and B. By substituting this assumed form into the original differential equation, we can solve for the coefficients A and B. After solving, we obtain the particular solution yp(x) = 2x + (27/10)e^(3x).

(c) To solve the initial value problem, we combine the complementary and particular solutions: y(x) = yc(x) + yp(x).

Given the initial conditions y(0) = 4, y'(0) = 13, and y''(0) = 33, we substitute these values into the general solution obtained in part (c). After evaluating the equations, we find the particular solution that satisfies the initial conditions: y(x) = (27/10)e^(3x) - (36/5)e^(2x) + 2x + 4.

To know more about equations visit:

brainly.com/question/649785

#SPJ11

The difference in the number of sit-ups between each day is constant. Therefore, we can use arithmetic sequence to solve that problem.

What we'll be looking for is [tex]a_{12}[/tex].

[tex]a_n=a_1+(n-1)\cdot d[/tex]

[tex]a_1=17[/tex]

[tex]d=4[/tex]

Therefore

[tex]a_{12}=17+(12-1)\cdot 4=17+11\cdot4=17+44=61[/tex]

Answer:

Answer for the question is A)

Answer:

A) 3:5 = 12:20

Step-by-step explanation:

The numbers should have the same proportion, so if you multiply the ratio with smaller numbers each by a specific number, it should equal the same ratio as the ratio with the bigger number (or even if you divide the ratio with bigger numbers to see if it equals the ratio with smaller numbers)

Example:

A) multiply 3:5 by 4:

3 x 4 = 12

5 x 4 = 20

Has the same proportion as 12:20, so that expresses a true proportion

B) multiply 14:6 by 2:

14 x 2 = 28

6 x 2 = 12

28:12 does not equal to 28:18, so not the same proportion.

C) multiply 6:2 by 7:

6 x 7 = 42

2 x 7 = 14

42:14 does not equal to 42:7, so not the same proportion.

The purpose of data mining is to analyze large sets of data to identify patterns and relationships that may not be immediately obvious.

While data validation is an important step in preparing data for analysis, it is not the primary goal of data mining. The purpose of data mining for analyzing data is not to find previously unknown:

Causal relationships: Data mining focuses on identifying patterns and correlations within the data, but it does not determine causality. While data mining can help identify associations and relationships between variables, it does not establish a cause-and-effect relationship between them.

Biases or ethical issues: Data mining primarily focuses on extracting insights and patterns from data, but it may not explicitly address biases or ethical concerns related to the data. The responsibility of addressing biases and ethical considerations lies with data collection practices, data preprocessing, and the interpretation of results.

Data quality improvement: Data mining can uncover patterns and anomalies in the data, but its main purpose is not to improve data quality. Data quality improvement typically involves data cleansing, data validation, and ensuring data accuracy, completeness, and consistency.

To know more about data validation, visit:

https://brainly.com/question/31429699

#SPJ11

Statement i is true, statement ii is false, and statement iii is true when interpreting them in the context of integers x and y.

i. The statement ∀x∃y: x + y = 0 can be interpreted as "For every integer x, there exists an integer y such that the sum of x and y is equal to zero." This statement is TRUE because for any integer x, we can choose y = -x, and the sum of x and -x will always be zero.

ii. The statement ∃y∀x: x + y = x can be interpreted as "There exists an integer y such that for every integer x, the sum of x and y is equal to x." This statement is FALSE because no matter what value of y we choose, the sum of x and y will always be different from x. There is no y that satisfies this condition for all values of x.

iii. The statement ∃x∀y: x + y = x can be interpreted as "There exists an integer x such that for every integer y, the sum of x and y is equal to x." This statement is TRUE because if we choose x to be any integer, the sum of x and any value of y will always be equal to x. The value of y does not affect the result of the sum, so this statement holds true for all integers x and y.

In summary, statement i is true, statement ii is false, and statement iii is true when interpreting them in the context of integers x and y.

To know more about integers refer here:

https://brainly.com/question/15276410

#SPJ11

To diagonalize a given matrix A, we need to find a matrix P such that P^(-1)AP is a diagonal matrix. In this exercise, we are given four matrices A and need to find the corresponding matrix P that diagonalizes each of them. We will then verify our work by computing P^(-1)AP for each case.

For each matrix A, we need to find a matrix P such that P^(-1)AP is a diagonal matrix. The matrix P is constructed by taking the eigenvectors of A as its columns. The diagonal elements of the diagonal matrix will be the eigenvalues of A.

Let's solve each case separately:

1) A = [14 12; 6 20]

We find the eigenvalues of A to be 2 and 32. The corresponding eigenvectors are [1; -1] and [1; 3]. Forming the matrix P with these eigenvectors as columns, we have P = [1 1; -1 3]. To verify our work, we compute P^(-1)AP, which should give us a diagonal matrix.

2) A = [2 7; 0 3]

The eigenvalues of A are 2 and 3. The corresponding eigenvectors are [1; 0] and [7; -2]. Forming the matrix P with these eigenvectors as columns, we have P = [1 7; 0 -2]. We verify our work by computing P^(-1)AP.

3) A = [0 0; 3 8]

The eigenvalues of A are 0 and 8. The corresponding eigenvectors are [1; 0] and [0; 1]. Forming the matrix P with these eigenvectors as columns, we have P = [1 0; 0 1]. We verify our work by computing P^(-1)AP.

In summary, we have found the matrix P that diagonalizes each of the given matrices A. To verify our work, we can compute P^(-1)AP and check if it gives us a diagonal matrix.

To learn more about diagonal matrix : brainly.com/question/31053015

#SPJ11

The value of VW which is the missing length of the given triangle VWZ would be = 43.2

To calculate the missing part of the triangle, the formula that should be used is given as follows;

XW/VX = YZ/YV

Where;

XW = 72

YZ = 55

VX = 72+VW

YV = 88

That is;

= 72/72+VW = 55/88

6,336 = 3960+55VW

55VW = 6336-3960

55VW = 2376

VW = 2376/55

= 43.2

Learn more about triangles here:

https://brainly.com/question/28470545

#SPJ1

The limit of the function is solved by L'Hopital's rule and the value of the relation [tex]\lim_{x \to 0} \frac{(x - tan^{-1}x )}{(x^{4} )} = -2/5[/tex]

Given data ,

To evaluate the limit of the expression  [tex]\lim_{x \to 0} \frac{(x - tan^{-1}x )}{(x^{4} )}[/tex], we can use series expansion.

Let's start by expanding the function tan⁻¹x in a Taylor series around x = 0. The Taylor series expansion for tan⁻¹x is:

[tex]tan^{-1}x = x - \frac{x^{3}}{3} + \frac{x^{5}}{5} - \frac{x^{7}}{7} + ...[/tex]

Now, let's substitute this expansion into the given expression:

[tex]\lim_{x \to 0} \frac{(x - tan^{-1}x )}{(x^{4} )}[/tex]

[tex]=\lim_{x \to 0} \frac{[ x - \frac{x^{3}}{3} + \frac{x^{5}}{5} - \frac{x^{7}}{7} + .. ]}{x^{4}} \\[/tex]

[tex]=\lim_{x \to 0} \frac{[ \frac{1}{3}+\frac{x^{2}}{5}+\frac{x^{4}}{7}..... ]}{x^{1}} \\[/tex]

Now, we can apply the limit as x approaches 0:

[tex]=\frac{[\frac{1}{3} -\frac{0}{5} +\frac{0}{7} ....]}{0}[/tex]

= 0/0 (indeterminate form)

To evaluate this indeterminate form, we can use L'Hopital's rule. Taking the derivative of the numerator and denominator, we get:

So, [tex]\lim_{x \to 0} \frac{(x - tan^{-1}x )}{(x^{4} )} = -2/5[/tex]

Hence , the limit of the expression [tex]\lim_{x \to 0} \frac{(x - tan^{-1}x )}{(x^{4} )} = -2/5[/tex]

To learn more about L'Hopital's rule click :

https://brainly.com/question/29480665

#SPJ4

The correct option is a) l = 94.78 feet.The angle of elevation of the sun is 34, and the height of a tree is 53 feet

We have to find the length of a shadow cast by the tree, represented by "l".Step-by-step solution:

Let AB be the tree, and BC be its shadow. We can assume that the angle of elevation of the sun is measured from the top of the tree, point A, to the sun, point S.

Therefore, the angle of elevation of the sun is ∠BAS.

Let's use trigonometry to solve for the length of the shadow, "l".tan(∠BAS) = opposite / adjacent tan(34)

= AB / BC

We know that AB = 53.

Therefore,

tan(34)

= 53 / BCB

= 53 / tan(34)B

= 94.78 feet (rounded to two decimal places)

Therefore, the length of the shadow cast by the tree is

l = BC

=94.78 feet, rounded to two decimal places.

To know more about angle of elevation visit:

https://brainly.com/question/12324763

#SPJ11

AC=5cm

CB=4cm

hypotenuse=5²+4²=25+16=41

hypotenuse=√41=6.40cm

Answer:

To calculate the experimental probability of landing on the word apple (A), you need to know how many times the spinner landed on apple (A) out of the 30 spins. Experimental probability is calculated by dividing the number of times the event occurred by the total number of trials.

In this case, the formula for calculating the experimental probability of landing on apple (A) would be:

P(apple) = (Number of times spinner landed on apple) / (Total number of spins)

Without knowing how many times the spinner landed on apple (A), it is not possible to calculate the experimental probability.

The expected number of students participating in each activity would be:

Playing: 45 students

Reading story books: 30 students

Watching TV: 20 students

Listening to music: 10 students

Painting: 15 students

To determine the number of students expected to participate in each activity, you can calculate the percentage of students engaging in each activity and then apply that percentage to the total student population of 2,000.

Playing: 45 students

Percentage: (45 / 2,000) x 100% = 2.25%

Expected number of students: 2.25% of 2,000 = 45

Reading story books: 30 students

Percentage: (30 / 2,000) x 100% = 1.5%

Expected number of students: 1.5% of 2,000 = 30

Watching TV: 20 students

Percentage: (20 / 2,000) x 100% = 1%

Expected number of students: 1% of 2,000 = 20

Listening to music: 10 students

Percentage: (10 / 2,000) * 100% = 0.5%

Expected number of students: 0.5% of 2,000 = 10

Painting: 15 students

Percentage: (15 / 2,000) x 100% = 0.75%

Expected number of students: 0.75% of 2,000 = 15

Learn more about Probability here;

https://brainly.com/question/31828911

#SPJ1

The interaction degrees of freedom for an ANOVA with six levels of Factor A and six levels of Factor B would be 25.

In an ANOVA with interaction, the interaction degrees of freedom are calculated as the product of the degrees of freedom for Factor A and Factor B.

In this case, since both Factor A and Factor B have six levels, the degrees of freedom for Factor A would be 6 - 1 = 5, and the degrees of freedom for Factor B would also be 6 - 1 = 5. Therefore, the interaction degrees of freedom would be 5 * 5 = 25.

The interaction degrees of freedom represent the variability in the data that is attributed to the interaction between Factor A and Factor B. It reflects the unique information gained from considering the joint effects of both factors and allows us to assess whether the interaction is statistically significant.

Learn more about Degrees:

brainly.com/question/364572

#SPJ11

Using sine rule, the bearing of A's route from C is 109.1°

To calculate the bearing of A's route from port C, we can use trigonometry and the given information. Let's denote the bearing of A's route from C as θ.

Since we have the value of three sides and only one angle, we can use sine rule to find the missing side.

a / sin A = b / sin B

10/ sin 40 = 8 / sin B

sin B = 8sin 40/ 10

sin B = 0.51423

B = sin⁻¹ (0.51423)

B = 30.94

Using the sum of angles in a triangle;

30.94 + 40 + x = 180

x = 109.1°

The bearing of A to C is 109.1°

Learn more on bearing here;

https://brainly.com/question/22719608

#SPJ1

125 degrees is  the missing angle of the triangle

In a triangle b=3 ;  a=9 ;  c=11

We want to determine the value of Angle C.

Since we are given three sides of the triangle, we use the Law of Cosines to find any of the angles.

C²=a²+b²-2abcosC

11²=9²+3²-2(9)(3)cosC

121=81+9-54cosC

121=90-54cosC

Subtract 90 from both sides

31=-54cosC

cosC=-31/54

C=cos⁻¹(31/54)

C=125 degrees

Hence, the missing angle of the triangle is 125 degrees

To learn more on trigonometry click:

https://brainly.com/question/25122835

#SPJ1

The quartiles and median of the attached box plot are,

Q₁, = 3 minutes ,M = 6minutes , and Q₃ = 11.5 minutes .

Yes , teachers surveyed had a commute time equal to median.

No ,boxplot does not remarks the number of teachers because frequency is not given.

From the attached box plot,

The quartiles and median commute times for the teachers surveyed are as follows,

Quartile 1 'Q₁' = 3 minutes

Median 'M' = 6 minutes

Quartile 3 'Q₃' = 11.5 minutes

Based on the given sample,

Yes it is true that one of the teachers surveyed had a commute time equal to the median commute time of 6 minutes.

The boxplot shows the distribution of commute times, and the median represents the middle value when the data is arranged in ascending order.

It is possible for the median to fall between two data points.

Since the sample size is odd 21 teachers there is an actual data point at the median.

However, for even sample sizes, the median would be an interpolation between two data points.

Based on the boxplot,

It cannot conclude that more teachers had commute times between 11.5 minutes and 21 minutes than between 1 minute and 3 minutes.

The boxplot only provides information about the distribution of the data and the spread of values.

It does not indicate the frequency or count of teachers falling within specific ranges.

Without additional information or a frequency distribution it cannot be determine the number of teachers in each range.

Therefore, the quartiles and median are Q₁, = 3 minutes ,M = 6minutes , and Q₃ = 11.5 minutes .

Yes , it is true that teachers surveyed had a commute time equal to median.

No , it is not possible as frequency is not given.

Learn more about median here

brainly.com/question/16583194

#SPJ4

The above question is incomplete, the complete question is:

A random sample of 21 teachers from a local school district were surveyed about their commute times to work. Their responses, rounded to the nearest half minute, were recorded and displayed using the following boxplot. All responses for commute times were different.

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Teacher Commute Times (in minutes)

(a) Identify the quartiles and the median commute times for the teachers surveyed.

(b) Based on the sample, must it be true that one of the teachers surveyed had a commute time equal to the median commute time? Justify your response.

(c) One student looked at the boxplot and remarked that more teachers had commute times between 11. 5 minutes and 21 minutes than between 1 minute and 3 minutes. Do you agree or disagree? Explain your answer

Attached figure.

The area of the shapes are ;

1. 155cm²

2. 236.3 cm²

The area of a shape is the space occupied by the boundary of a plane figures like circles, rectangles, and triangles.

1. The shape is divided into parallelogram and trapezium.

area of trapezoid = 1/2(a+b) h

= 1/2( 3+13)8

= 1/2 × 16 × 8

= 64cm²

area of parallelogram

= b× h

= 13 × 7

= 91 cm²

The area of the shape = 91 +64

= 155cm²

2. area of 2 semi circle = area of circle

Therefore the surface area of the shape = πr² + πrh

= πr(r+h)

= 3.14 × 3.5( 3.5 + 18)

= 10.99 × 21.5

= 236.3 cm²

learn more about area of shape from

https://brainly.com/question/25965491

#SPJ1

The given equation for the fractional part of a battery, B, that is still good after I hours of use is B = 3-004. We need to find the fractional part of the battery that is still operating after 100 hours of use.

To do that, we substitute the value of I with 100 in the equation B = 3-004:

B = 3-004 = 3-004 = 2-996.

Therefore, after 100 hours of use, the fractional part of the battery that is still operating is 2-996.

The equation B = 3-004 represents the relationship between the fractional part of the battery that is still good and the hours of use. The term 3-004 represents the fraction of the battery that is still operating after a certain number of hours. By substituting I with 100 in the equation, we can determine the specific fractional part of the battery that remains operational after 100 hours of use, which is calculated to be 2-996. This means that approximately 2.996 or 99.6% of the battery is still functioning after 100 hours.

Learn more about fractional here : brainly.com/question/10354322

#SPJ11

Answer:

No, false, absolutely not, nada, by no means, not at all.

Step-by-step explanation:

When approaching complex, multi-step problems, I always tell people to list the information they have first and then make a plan to solve their problem to minimize mistakes.

The information that we have right now:

- She bought a dress for $29.98

- She bought shoes for $39

- She bought 2 belts for $14.99 each

- The tax for everything was $7.92

The plan:

Add up everything and see if if it is less or more than $100.

29.98+39+14.99(2)+7.92 = ?

= 106.88

106.88 is more than 100, so NO, she CANNOT pay for everything with 100$

Since the probability that each airplane part passes inspection is 93%, the probability that all five of the next parts pass inspection is:

(0.93)^5 = 0.696

Use code with caution. Learn more

This is about a 70% chance that all five of the next parts will pass inspection.

However, it is important to note that this is just a probability. It is possible that all five parts will pass inspection, but it is also possible that none of them will pass inspection

If the bank changed its policy to charge the interest compounded quarterly at the same rate, the amount Gita would be paying after the change in the bank's policy for two years would be approximately Rs 107,656.99.

To calculate the amount Gita would be paying after the change in the bank's policy, we need to consider two separate compounding periods: the first year with semi-annual compounding and the second year with quarterly compounding.

First, let's calculate the amount after the first year using semi-annual compounding. The formula to calculate the amount with compound interest is given by:

A = P * (1 + r/n)^(n*t)

Where:

A = Amount after time t

P = Principal amount (initial loan)

r = Annual interest rate (as a decimal)

n = Number of compounding periods per year

t = Time in years

For the first year, Gita borrowed Rs 85,000 at an annual interest rate of 12%, compounded semi-annually. So, we have:

P = Rs 85,000

r = 12% = 0.12

n = 2 (semi-annual compounding)

t = 1 (year)

Using the formula, the amount after the first year is:

A1 = 85000 * (1 + 0.12/2)^(2*1) ≈ Rs 95,860.00

Now, for the second year, the compounding frequency changes to quarterly. The formula remains the same, but now we have:

P = Rs 95,860.00 (amount after the first year)

r = 12% = 0.12

n = 4 (quarterly compounding)

t = 1 (year)

Using the formula, the amount after the second year is:

A2 = 95860 * (1 + 0.12/4)^(4*1) ≈ Rs 107,656.99

Therefore, the amount Gita would be paying after the change in the bank's policy for two years would be approximately Rs 107,656.99.

For more details regarding compound interest, visit:

https://brainly.com/question/14295570

#SPJ1

Step-by-step explanation:

27:84:38      divide all of the terms by 27   ( to get '1' as the first number)

1  :  3.1  :  1.4

In statistics, SSB stands for the "sum of squares between groups." The sum of squares between groups (SSB) is a measurement of the difference between the sample means and the population mean.

The variability between the treatment conditions must be established in order to do the SSB (Sum of Squares Between) calculation. The SSB calculates the variations in group means.

First, we determine the data's overall mean:

Mean = (10 + 12 + 13 + 8 + 17 + 20 + 10 + 9 + 6 + 10 + 26) / 15 = 12

The mean is then determined for each treatment condition:

The average number of warnings is (10 + 8 + 10 + 6) / 4 = 8.5 

The average number of warnings is (12 + 17 + 9 + 10) / 4 = 12.

(13, 20, and 26) / 3 (two warnings on average) = 19.67

The following formula can be used to determine SSB:

SSB is equal to n1 times the overall mean (Mean1), n2 times the overall mean (Mean2), and n3 times the overall mean (Mean3).

where the sample sizes for each treatment condition are n1, n2, and n3.

Given the information, n1 = 4, n2 = 4, and n3 = 3.

SSB = 4 * (8.5 - 12)^2 + 4 * (12 - 12)^2 + 3 * (19.67 - 12)^2

= 4 * (-3.5)^2 + 4 * (0)^2 + 3 * (7.67)^2

= 49 + 0 + 176.88

= 225.88

SSB is therefore 225.88 (rounded to the nearest hundredth).

To know more about the Sum of Squares Between Groups visit:

https://brainly.com/question/32612642

#SPJ11

After 8 seconds the ball height was 42 units.

It is defined as the graph of a quadratic function that has something bowl-shaped.

It is given that on a game show, contestants shoot a foam ball toward a target. The table includes points along one path the ball can take to hit the target where x is the time that has passed since the ball was launched and y is the height at this time.

It is required to find how high was the ball after 8 seconds.

The orbit of the ball will be a parabola.

We know the standard form of a quadratic function:

[tex]\text{y}=\text{ax}^2+\text{bx}+\text{c}[/tex] where [tex]\text{a}\ne\text{0}[/tex]

At x = 0 and y = 10, we get:

[tex]\sf 10=a(0)^2+b(0)+c[/tex]

[tex]\sf 10=c[/tex]

[tex]\sf c=10[/tex]

At x = 2 and y = 24, we get:

[tex]\sf 24=a(2)^2+b(2)+c[/tex]

[tex]\sf 24=4a+2b+10[/tex]

[tex]\sf 4a+2b=14[/tex]                   ....(1)

At x = 16 and y = 10, we get:

[tex]\sf 10=a(16)^2+b(16)+c[/tex]

[tex]\sf 10=256a+16b+10[/tex]

[tex]\sf 256a+16b=0[/tex]               ....(2)

By solving equations (1) and (2), we get;

a = - 1/2, b = 8 and c = 10

Putting these values in the standard form of a quadratic function, we get:

[tex]\sf y=-\sf \frac{1}{2}x^2 +8x+10[/tex]

Now, after 8 seconds means when x = 8, we get:

[tex]\sf y=-\sf \frac{1}{2}\times 8^2 +8\times8+10[/tex]

[tex]\sf y=-32+64+10[/tex]

[tex]\sf y=42[/tex]

Thus, after 8 seconds the ball height was 42 units.

Know more about the parabola here:

https://brainly.com/question/9741856

True. When computing a t statistic, it is necessary to use the sample variance (or standard deviation) to estimate the standard error for the sample mean.

The standard error represents the standard deviation of the sampling distribution of the sample mean. By using the sample variance (or standard deviation), we can estimate the variability of the sample mean from the population mean.

The formula to calculate the standard error of the sample mean is: standard deviation / √(sample size). The sample variance is used to estimate the population variance, and the sample standard deviation is the square root of the sample variance.

The t statistic is computed by dividing the difference between the sample mean and the population mean by the estimated standard error of the sample mean. This t statistic is used in hypothesis testing or constructing confidence intervals when the population parameters are unknown.

Therefore, the sample variance (or standard deviation) is crucial in calculating the estimated standard error, which in turn is necessary for computing the t statistic and making statistical inferences about the sample mean.

Learn more about statistic here:

https://brainly.com/question/31577270

#SPJ11

Measure of angle D in the quadrilateral ABCD is 55°.

Given a quadrilateral which is inscribed inside a circle.

Opposite angles of a quadrilateral sum up to 180°.

2x - 7 + x + 4 = 180

3x - 3 = 180

3x = 183

x = 61

∠D + 2x + 3 = 180

∠D + 2(61) + 3 = 180

∠D = 55°

Hence the angle D is 55°.

Learn more about Angles of Quadrilateral here :

https://brainly.com/question/30378561

#SPJ1

Answer: 648cm^3

Step-by-step explanation:

Volume=area of base * height

Area of base: 0.5*9*24=108

108*6=648cm^3

Therefore, the first partial derivatives of the function f(x, y, z) = 9x sin(y - z) are: fx(x, y, z) = 9 sin(y - z), fy(x, y, z) = 9x cos(y - z), fz(x, y, z) = -9x cos(y - z).

To find the first partial derivatives of the function f(x, y, z) = 9x sin(y - z), we differentiate with respect to each variable separately.

fx(x, y, z):

Taking the derivative with respect to x, we treat y and z as constants:

fx(x, y, z) = 9 sin(y - z)

fy(x, y, z):

Taking the derivative with respect to y, we treat x and z as constants:

fy(x, y, z) = 9x cos(y - z)

fz(x, y, z):

Taking the derivative with respect to z, we treat x and y as constants:

fz(x, y, z) = -9x cos(y - z)

Therefore, the first partial derivatives of the function f(x, y, z) = 9x sin(y - z) are:

fx(x, y, z) = 9 sin(y - z)

fy(x, y, z) = 9x cos(y - z)

fz(x, y, z) = -9x cos(y - z)

To know more about partial derivatives,

https://brainly.com/question/31397062

#SPJ11

Answer:

x = 165°

Step-by-step explanation:

Linear pair: If the uncommon arm of adjacent angles form a straight line, then they are called linear pair and these adjacent angles add up to 180°

        15 + x = 180

Subtract 15 from both sides,

                x = 180 - 15

               x = 165°