After evaluating the expression, the value of n is √(70/2C).
What are expressions?An expression, also known as a mathematical expression, is a finite combination of symbols that are well-formed in accordance with context-dependent rules. An expression in mathematics is made up of numbers, variables, and functions (such as addition, subtraction, multiplication or division, etc.) You can think of expressions as being similar to phrases.So, 2nCn = 70:
Now, solve for n as follows:
2nCn =702Cn² = 70n² = 70/2Cn = √(70/2C)Therefore, after evaluating the expression, the value of n is √(70/2C).
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HELP NEEDED FOR GEOMETRY PROOFS!!! I will give brainliest
The method used to prove the specified geometric relationship between the angles and sides of the triangles are as follows:
24. ΔDAE ≅ ΔBAC by SAS postulate, therefore
∠B ≅ ∠E CPCTC25. ΔACD ≅ ΔBCD by ASA postulate
∡A ≅ ∡B CPCTC26 ΔACD ≅ ΔBCD LH postulate.
∡A ≅ ∡B CPCTCWhat are the congruency postulates?The congruency postulates include, SSS, Side-Side-Side, AAS, Angle-Angle Side, SAS, Side-Angle-Side, HL, Hypotenuse Leg.
24. The two column proofs are presented as follows;
Statements Reasons
1. [tex]\overline{CD}[/tex] bisects [tex]\overline{BE}[/tex] 1. Given
2. [tex]\overline{BA}[/tex] = [tex]\overline{AE}[/tex] 2. Definition of bisected line
3. . [tex]\overline{BA}[/tex] ≅ [tex]\overline{AE}[/tex] 3.. Definition of congruency
4. [tex]\overline{CA}[/tex] = [tex]\overline{AD}[/tex] 4. Definition of bisection of line [tex]\overline{CD}[/tex]
5. [tex]\overline{CA}[/tex] ≅ [tex]\overline{AD}[/tex] 5. The definition of congruency
6. ∠DAE ≅ ∠BAC 6. Vertical angles theorem
7. ΔDAE ≅ ΔBAC 7. SAS congruency postulate
8. ∠B ≅ ∠E 8. CPCTC
The acronym, CPCTC represents Corresponding Parts of Congruent Triangles are Congruent
25. Statement Reasons
1. [tex]\overline{CD}[/tex] ⊥ [tex]\overline{AB}[/tex] 1. Given
2. [tex]\overline{CD}[/tex] bisects ∠ACB 2. Given
3. ∠3 = ∠4 = 90° 3. Definition of bisected lines
4. ∠1 ≅ ∠2 4. Definition of bisected angle ∡ACB
5. ΔACD ≅ ΔBCD 5. ASA congruency postulate
6. ∡A ≅ ∡B 6. CPCTC
26. Statement Reason
1. m∠1 = m∠2 = 90° 1. Given
2. ΔACD and ΔBCD are right triangles 2. Definition
3. [tex]\overline{AC}[/tex] ≅ [tex]\overline{BC}[/tex] 3. Given
4. [tex]\overline{CD}[/tex] ≅ [tex]\overline{CD}[/tex] 4. Reflexive property
5. ΔACD ≅ ΔBCD 5. LH Congruency postulate
6 ∡A ≅ ∡B 6. CPCTC
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David will rent a car foe a day. The rental company offers two pricing options: Option A and Option B. For each pricing option, cost (in dollars) depends on miles driven, as shown below.
Let
y ----> total cost in dollars
x -----> number of miles
we have that
Option B
y=50
Option A
Find out the slope
take two points from the graph
(0,20) and (150,50)
m=(50-20)/(150-0)
m=30/150
m=1/5=$0.20 per mile
therefore
y=0.20x+20
Part A
For x=75 miles
Option A -----> y=0.20(75)+20=$35
Option B ------> y=$50
therefore
Option A costs less
Find out the difference
$50-$35=$15
Cost $15 less than the other option
Part B
Looking at the graph
For x=150 miles
Both options cost the same
If David drives more than this amount option B costs less
Solve the proportion 4/x = 7/26 X=
given the proportion :
[tex]\frac{4}{x}=\frac{7}{56}[/tex]we will find x as follows:
[tex]\begin{gathered} \frac{7}{56}=\frac{7\cdot1}{7\cdot8}=\frac{1}{8} \\ \\ \frac{4}{x}=\frac{1}{8} \\ \\ x=4\cdot8=32 \end{gathered}[/tex]So, the answer is: x = 32
Determine whether the two triangles are similar. If they
are similar, write the
similarity statement.
Answer:
not similar
Step-by-step explanation:
You want to know if two isosceles triangles are similar, given that one has a base angle of 78°, and the other has an a.pex angle of 16°.
Base angleThe base angles of the triangle with a.pex angle 16° will be ...
(180° -16°)/2 = 82° . . . . . . not 78°
SimilarityTwo isosceles triangles will be similar if they have congruent base angles. These triangles do not, so they are not similar.
12. Find the value of x.
+f
(7x+4) +(10x-11)=180 mid segment
The value of x is 11.
What is an equation?
Equations are mathematical statements which contains two algebraic expressions on both sides of an equal to '=' sign. it represents the relationship of equality among the expressions.
We are given an equation (7x+4)+(10x-11)=180
We open brackets and simplify the equation by adding similar values we get
17x-7=180
17x=187
on dividing both sides by 17 we get
x=11
Hence the value of x is 11
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Can someone please answer this!
Answer: see the attachment
Step-by-step explanation:
h = # of hours worked
{10h and {15(h-40)+400 are both functions i.e. simplified equations
simply fit the # of hours worked in each equation to get the values. you can also double check your work or to understand better
to do so, take (h) # of hours worked and multiply by the pay rate. This gives the total pay over the work week. then take the extra hours beyond the 40. ie 7. if $10 is the pay rate per hour and OT is 1.5xnormal pay then 10x1.5=15. Multiply 15x7 and you get 105 then add to 400 and you get $505. 400 comes from 10(40).
part b and c is just setting the functions.
so instead of 40 hrs per week your full-time rate is now 38 and anything beyond would be counted as overtime. so a normal work week of 38 hrs x the $10/hr would equate to $380 for the week.
part c, if the hours per week were kept normal at 40hrs/week but the pay rate is increased this then changes 10 = h to 12 = h. if 12=h and you work 40hrs/week, then 12(40)=$480 for the normal work week. also this changes your OT pay from 10(1.5)=15 to 12(1.5)=$18
What is the y-intercept in the equation y = 45x + 65?
Answer:
The y intercept is : 65
Step-by-step explanation:
The y intercept is 65 as it is in the form of y=mx+c.
The c is the y intercept, being 65
Which number is greatest?
-1
-4
-6
Answer:
Step-by-step explanation:
-1>-4>-6
-1 is the greatest number.
The side lengths of a rectangle have a ratio of 7 to 5. If the perimeter is 300 meters, find the length and width of the rectangle.
The length is 25 cm and width is 35 cm. A rectangle is a closed two-dimensional shape with four sides, four corners, and four right angles (90°). A rectangle's opposite sides are equal and parallel.
What is perimeter?A perimeter is a closed path that encompasses, surrounds, or outlines a two-dimensional shape or length. The circumference of a circle or an ellipse is its perimeter. There stood several practical applications for calculating the perimeter. Perimeter is the length of the shape's boundary. It is given by the sum of the shape's sides. It has one dimension and is measured in linear units. Area, on the other hand, quantifies the amount of space occupied by the shape. It has two dimensions and is measured in square units. The perimeter of an object is the distance around it.Therefore,
The sides of the rectangle are in the ratio of 7: 5
Let the length 1=5x
and the breadth b=7 x
Now, perimeter =2(1+b)=300cm
2(5 x+7 x)=300
2(35 x)=300
70 x=300
x=4.28
Therefore, Length 1=5x =25 cm
and the breadth b=7x= 35 cm
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You rent an apartment that costs \$1000$1000 per month during the first year, but the rent is set to go up 8% per year. What would be the rent of the apartment during the 5th year of living in the apartment? Round to the nearest tenth (if necessary).
If you rent an apartment that cost $1000 per month during the first year, but the rent is set to go up 8% per year, the the rent amount of the apartment during the 5th year of living in the apartment is $1469.32
The initial rent amount = $1000
The percent of rent increase each year = 8%
Time period = 5 years
Here we can use the compound interest equation
A = [tex]P(1+\frac{r}{100})^t[/tex]
Substitute the values in the equation
The rent amount of the apartment during the 5th year of living in the apartment = [tex]1000(1+\frac{8}{100})^5[/tex]
= $1469.32
Hence, if you rent an apartment that cost $1000 per month during the first year, but the rent is set to go up 8% per year, the the rent amount of the apartment during the 5th year of living in the apartment is $1469.32
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with grade > * 0.2 Add, subtract, multiply, and divide whole numbers: word problem
A group of tourists needs rental cars to get around the city. There are 3,376 tourists in
the group. If each rental car holds 8 people, how many cars will the group need?
Using division, we know that the number of cars needed by 3,376 tourists is 422.
What is division?The division is splitting into equal parts or groups.The division allows us to divide or 'share' numbers to find an answer.Division sign (÷) is a symbol consisting of a short horizontal line with a dot above and another dot below, used to indicate mathematical division.The division of any number by zero is undefined. In this case, the result can be written as infinity. For example, 15/0 = ∞, i.e. undefined.We can represent the division with ÷, slash (/), or a horizontal line ( _ ). We can use these symbols at our convenience when dealing with different types of computations or division questions.So, the total number of groups of tourists = 3376
One car holds 8 people.To find the number of cars needed. Hence,
The number of cars needed = 3376/8= 422Therefore, using division we know that the number of cars needed by 3,376 tourists is 422.
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a random sample of 80 observations results in 50 successes. a. construct the 95% confidence interval for the population proportion of successes. b. construct the 95% confidence interval for the population proportion of failures
In 95% confidence interval for the population proportion of successes
exists CI = 0.625 +/- 1.96 × sqrt(0.625 × 0.375/80).
In 95% confidence interval for the population proportion of failures
exists CI = 0.375 +- 1.96 × sqrt(0.375 × 0.625/80).
What is meant by confidence interval?The mean of your estimate plus and minus the range of that estimate constitutes a confidence interval. Within a specific level of confidence, this is the range of values you anticipate your estimate to fall within if you repeat the test. In statistics, confidence is another word for probability.
You have a 5% probability of being incorrect with a 95% confidence interval. You have a 10% probability of being incorrect with a 90% confidence interval. A 95% confidence interval is narrower than a 99% confidence interval (for example, plus or minus 4.5 percent instead of 3.5 percent).
a) Sample proportion of successes (phat) = 50/80 = 0.625
z-critical for 95% CI is 1.96
CI = 0.625 +/- 1.96 × sqrt(0.625 × 0.375/80)
b) sample proportion of failures (phat) = 30/80 = 0.375
CI = 0.375 +- 1.96 × sqrt(0.375 × 0.625/80)
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A segment MN has endpoints M(-7.-6) and N(7,7). Find the coordinates of partition point P that divides the segment into a 5:2 ratio.
A segment MN has endpoints M(-7.-6) and N(7,7). Find the coordinates of partition point P that divides the segment into a 5:2 ratio.
___________________________
Find the coordinates of partition point P that divides the segment into a 5:2 ratio.
5:2 means that it is divided into 7, and we do not move two positions from (7,7)
X axis
7- (-7) = 14
14/7 = 2
7-2*2 = 3
Y axis
7-(-6)= 13
13/7 =
7 - 2* (13/7) = 49/7 - 26/ 7 = 23/7 = 3 2/7
______________________________
Answer
(3, 3 2/7)
Kara is building a fence. The drawing above shows two sections of the fence. Help Kara figure out the
materials and cost for her project. Show all work. Use a calculator and round answers to the nearest
hundredth.
(a) The vertical fence posts are 5 feet tall. The diagonal pieces are 9 feet. How far apart should the fence posts be placed
(b) Kara's fence needs to reach at least 93 feet. How many fence posts will she need?
(c) How many diagonal pieces will she need?
(d) The fence posts cost $17 and the diagonal pieces cost $3.50. Calculate Kara’s total cost.
The materials and cost of Kara's project obtained using Pythagorean theorem, are;
(a) Distance between fence posts is 2•√(14) feet
(b) Kara needs about 12 fence posts
(c) Kara will need 22 diagonal pieces
(d) Kara's total cost is $281
What is the Pythagorean theorem?Pythagoras theorem can be stated as, the square of the length of the hypotenuse side of a right triangle is equal to the sum of the squares of the other two sides.
The drawing obtained from a similar question consists of two diagonals between consecutive posts.
(a) The given parameters are;
Height of the fence post = 5 feet
Length of the diagonal pieces = 9 feet
The distance, d, between the fence posts using Pythagorean theorem gives;
d² = 9² - 5² = 56
d = 2•√(14)
The distances between the fence posts should therefore be 2•√(14) feet
(b) The number of fence posts, n, is given by the equation;
2•√(14) × n = 93
Which gives;
[tex] \displaystyle {n = \frac{93 }{2 \cdot \sqrt{14}} \approx 12.43}[/tex]
Given that after the 12th post, the 1st post comes next and the distance remaining is less than d, the number of posts, n is 12
(c) The number of diagonal pieces, m, needed, given that there are two diagonal pieces between two posts and there is only 11 in between spaces, gives;
m = 2 × 11 = 22
There are 22 diagonal pieces
(d) Cost of a fence post = $17
Cost of a diagonal piece = $3.5
Total cost, C, is therefore;
C = 12 × 17 + 22 × 3.5 = 281
Kara's total cost is $281
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Ms.walker bought a computer for 15% off from the list price of p dollars. if the sales tax was 8%, how much did she pay for the computer including sales tax?
Ms. Walker paid $0.918*p for the computer including sales tax .
In the question ,
it is given that
discount on list price for the computer is 15%
sales tax = 8%
let the list price for the computer be $p .
So, sales price is = p - 0.15*p = 0.85*p
tax on sale price is = 8% of 0.85*p = 0.08*0.85*p = 0.068*p
Total Price = sale price + tax on sale price
Substituting the values of tax and sale price ,
we get
total price = 0.85*p + 0.068*p
= 0.918*p
Therefore , she paid $0.918*p for the computer including the sales tax .
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Sandi randomly selects a single bill from an envelope containing 8 ones, 5 fives, 4 tens, and 3 twenties. Whatis the expected value of the money she selects?expected value =
the formula to get the expected value is
[tex]E(x)=\sum ^n_{i\mathop=1}x_if(x_i)[/tex]So, first we calculate teh probabilities. We have 20 bills in total. so we divide the quantity of bills of each value by the total:
we have 8 ones: 8/20= 2/5
5 fives: 5/20=1/4
4 tens: 4/20= 1/5
3 twenties = 3/20
now, we multiply each value with te probabilitiy of picking it and add all
[tex]E=\text{ 1}\cdot\frac{2}{5}+5\cdot\frac{1}{4}+10\cdot\frac{1}{5}+3\cdot\frac{3}{20}=\text{ 4.1}[/tex]the expected value is 4.1
awnser for this question
The equation of the line that is parallel to k and passes through (-1, 3) is
- x + 2y = 7
How to find the equation of a line?The equation of a line can be represented in different form such as point slope form, slope intercept form and standard form.
Therefore, the equation of the line is parallel to k.
Parallel line shave the same slope.
Therefore, let's find the slope of k to find the slope of the equation of the line.
Hence, using (7, 2)(1, -1)
m = -1 - 2 / 1 - 7
m = - 3 / -6
m = 1/ 2
Therefore, the slope of the line is 1 / 2. Let's find the y-intercept using the point (-1, 3)
3 = 1 / 2(-1) + b
3 = - 1 / 2 + b
b = 3 + 1 / 2
b = 7 / 2
Hence, the equation is as follows;
y = 1 /2x + 7 / 2
2y = x + 7
2y - x = 7
- x + 2y = 7
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Kayla gave 13 of a pan of brownies to Ella and 16 of the pan to Eli. Which choice is the MOST reasonable for the part of the pan of brownies Kayla gave away?
The reasonable fraction for the part of the pan of brownies Kayla gave away is 1/2.
How to illustrate the information?Kayla gave 1/3 of a pan of brownies to Ella and 1/6 of the pan to Eli.
Therefore, the part given away will be the addition of the fractions. This will be:
= 1/3 + 1/6
= 2/6 + 1/6
= 3/6
= 1/2
Therefore, 1/2 of the brownies were given away.
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How many positive factors of 96 are also multiples of 12?
The number of positive factors of 96 which are also multiples of 12 are 4 which are 12,24,48, and 96.
Positive factors of 96 = 1,2,3,4,6,8,12,16,24,32,48 and, 96
Multiples of 12 upto 96 = 12,24,36,48,60,72, 84 and 96
Common numbers between the two are 12,24,48 and 96.
Hence, there are only 4 positive factors of 96 which are also the multiples of 12
Factors
Factors are the numbers that can divide a number exactly. Hence, after division, there is no remainder left.
Multiples
A multiple is a result obtained by multiplying a number by an integer(it shouldn’t be a fraction). The multiples of the whole number are obtained by taking out the product of the counting numbers and that of whole numbers.
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Reuben drove 243 miles using 12 gallons of gas. At this rate, how many miles would he drive using 16 gallons of gas?
Answer:
324 miles
Step-by-step explanation:
Set up a proportion
243
12
=
x
16
Cross multiply
12
x
=
3888
x=324 miles
A car's velocity is modeled by v(t) = 0.5t^2 -14t+ 80 for 0 less than or equal to t less than or equal 14, where the velocity is in feet per second and time is in seconds. Where does the car come to a complete stop?
The car stops after moving for 20 seconds
How to determine when the car comes to a stop?From the question, the function is given as
v(t) = 0.5t^2 - 14t + 80
When the car comes to a stop, the vehicle is 0
This is represented as
v(t) = 0
So, we have
0.5t^2 - 14t + 80 = 0
Expand the equation
0.5t^2 - 10t - 4t + 80 = 0
Factorize the equation
0.5t(t - 20) - 4(t - 20) = 0
So, we have
(0.5t - 4)(t - 20) = 0
Solve for t
t = 8 and t = 20
20 is greater than 8
Hence, the car comes to a stop at 20 seconds
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NEED HELP PLEASE!!!!!
Answer: [tex]x=-\frac{1}{2}, y=\frac{9}{2}[/tex]
Step-by-step explanation:
[tex]5x+7=7x+8\\\\2x=-1\\\\x=-\frac{1}{2}\\\\\implies y=5\left(-\frac{1}{2} \right)+7=\frac{9}{2}[/tex]
Of the ice cream cones sold yesterday at Zeke's Ice Cream Shop, 3/10 were chocolate and another 3/10 were vanilla. What fraction of the ice cream cones sold were either chocolate or vanilla?
The fraction of ice cream cones sold that are either chocolate or vanilla is 3/5.
What is the fraction?A fraction is a non-integer that is made up of a numerator and a denominator. An example of a fraction is 3/5. 3 is the numerator and 5 is the denominator.
In order to determine the fraction of ice cream cones sold that are either chocolate or vanilla, add the fraction of chocolate cones sold and vanilla cones sold together. Addition is the process of determining the sum of two or more numbers.
Fraction of ice cream cones sold that are either chocolate or vanilla = 3/10 + 3/10 = 6/10 = 3/5.
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A fish tank sprung a leak and loses 45% of its water.
There is now 363 litres of water in the fish tank.
How much water was in the fish tank before the leak?
Answer:
689.7
Step-by-step explanation:
Theorems and Proofs problemIll send a picture of the question
According to the given information, the reason for the second statement is definition of supplementary angles, this is because the definition of supplementary angles says that the sum of two supplements is 180°.
It means that the answer is B. Definition of supplementary angles.
Practice Problems
1. Mai and Priya were on scooters. Mai traveled 15 meters in 6 seconds. Priya travels
22 meters in 10 seconds. Who was moving faster? Explain your reasoning
2. Here are the prices for cans of juice that are the same brand and the same size at
different stores. Which store offers the best deal? Explain your reasoning
Store X: 4 cans for $2.48
per can
Store Y: 5 cans for $3.00
Store Z: 59 cents
Topic B
3. Costs of homes can be very different in different parts of the United States.
1. A450-square-foot apartment in New York City costs $540,000. What is the
price per square foot? Explain or show your reasoning
2. A 2,100-square-foot home in Cheyenne, Wyoming, costs $110 per square
foot. How much does this home cost? Explain or show your reasoning
4. There are 33.8 fuld ounces in a liter. There are 128 fuid ounces in a galon. About
how many liters are in a gation?
A 2
B. 3
C. 4
D. 5
Is your estimate larger or smaller than the actual number of liters in a gallon? Explain
how you know.
-
Answer:
1. Mai was moving faster as she covered a greater distance in the same amount of time.
Speed = Distance
-----------
Time
2. The best deal is Store Z. We must divide to determine the price each business is charging for a single can in order to particularly choose the greatest deal.
For Store X, each can is $0.62
For Store Y, each can is $0.60
Store Z is the best deal due to how cheap each can of juice costs.
3 (Part 1) It costs $1,200 for each square foot. The cost of the apartment is $540,000 & the area of the apartment is 450 feet. You can divide 540,000 by 450 and you should get 1,200.
3 (Part 2) The home costs $231,000. You can use the two numbers in the question "2,100" and "110". You should get $231,000 after adding those two numbers.
4. Approximately 3.8 liters are in a gallon. 3.8 is closest to 4 so you can round it up to 4 liters.
Step-by-step explanation:
Two numbers have a sum of 35 and a product of 250. what is the number
help please do in few mins
The length of the red line segment on this number line is: C. 2 1/2.
What is a number line?A number line simply means a type of graph with a graduated straight line which comprises both positive and negative numbers that are placed at equal intervals along its length.
This ultimately implies that, a number line can be used to compare or determine the difference (distance) between two numbers plotted on it. Additionally, a number line primarily increases in numerical value towards the right and decreases in numerical value towards the left.
Note: Each interval on this number line represents 1/4 and the total intervals between the red dots is 10.
From the number line shown above, we have:
Distance = 10 × (1/4)
Distance = 10/4
Distance = 5/2
Distance = 2 1/2.
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note: this is a multi-part question. once an answer is submitted, you will be unable to return to this part. 7 women and 7 men are on the faculty in the mathematics department at a school. how many ways are there to select a committee of five members of the department if at least one woman must be on the committee?
No. of ways of selecting the 5 member committee by combination= 1981
What are the number of ways of selecting the 5 member committee ?
No. of women faculty in the mathematics department = 7
No. of men faculty in the mathematics department = 7
Total number of faculty members = 14
Condition - at least one woman must be on the committee
No. of ways of selection = C (14, 5) - C (7, 5)
We know that combination C(n , r) = [tex]\frac{n!}{(n-r)!r!}[/tex]
Consider the total combination C (14, 5),
[tex]C (14, 5)=\frac{14!}{9!5!} \\\\=\frac{14 *13* 12 *11 *10 *9!}{9!* 5!} \\\\=\frac{14 *13* 12 *11 *10}{120} \\\\= \frac{240240}{120} \\\\= 2002[/tex]
Consider the combination of men C (7, 5) ,
[tex]C (7, 5)=\frac{7!}{2!5!} \\\\=\frac{7*6*5!}{2!* 5!} \\\\=\frac{7*6}{2} \\\\= 7*3\\\\=21[/tex]
No. of ways of selection = C (14, 5) - C (7, 5)
= 2002 - 21
=1981
No. of ways of selecting the 5 member committee of the department with least one woman by combination= 1981
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A store sells 3 T-shirts for 28.14
Answer:
Step-by-step explanation:
1 T shirt = 28.14
There are 2 methods this can be done.
Method `1
Adding 3 times
28.14 + 28.14 + 28.14 = $84.42
Method 2
Multiplying 28.14 by 3
28.14 times 3 = $84.42
Therefore answer is 84.42