Answer:
28/21 = 3x - 7/x+11
x = 13
Step-by-step explanation:
The value of x from the given diagram is 13. Option A is correct.
Similarity theorem:From the given similar triangles;
28/3x-11 = x+11/21Cross multiply
28(21) = (3x-11)(x+11)
(3x-11)(x+11) = 588
Expand
3x^2 + 33x - 11x - 121 = 588
3x^2+22x- 709 =0
On factorizing, the value of x is 13
Learn more on similar triangles here: https://brainly.com/question/2644832
Item2 10 points eBookPrintReferences Check my work Check My Work button is now enabledItem 2Item 2 10 points In an article in the Journal of Advertising, Weinberger and Spotts compare the use of humor in television ads in the United States and the United Kingdom. They found that a substantially greater percentage of U.K. ads use humor. (a) Suppose that a random sample of 400 television ads in the United Kingdom reveals that 142 of these ads use humor. Find a point estimate of and a 95 percent confidence interval for the proportion of all U.K. television ads that use humor. (Round your answers to 3 decimal places.) (b) Suppose a random sample of 500 television ads in the United States reveals that 122 of these ads use humor. Find a point estimate of and a 95 percent confidence interval for the proportion of all U.S. television ads that use humor. (Round your answers to 3 decimal places.) (c) Do the confidence intervals you computed in parts a and b suggest that a greater percentage of U.K. ads use humor? Next Visit question mapQuestion 2 of 4 Total2 of 4 Prev
Answer:
a
point estimate is [tex]\r p = 0.355[/tex] i.e 35.5 %
confidence interval is [tex]0.3081 < p<0.4019[/tex]
b
point estimate is [tex]\r p = 0.244[/tex] i.e 24.4 %
confidence interval [tex]0.2064 < p<0.2816[/tex]
c
The confidence intervals you computed in parts a and b does not suggest that a greater number of U.K. ads use humor
Step-by-step explanation:
Considering the first question
The sample size is n = 400
The number of ads that use humor is k = 142
Generally the point estimate is mathematically represented as
[tex]\r p = \frac{k}{n}[/tex]
=> [tex]\r p = \frac{142}{400}[/tex]
=> [tex]\r p = 0.355[/tex]
Given that the confidence level is 95% then the level of significance is
[tex]\alpha =( 100 -95)\%[/tex]
=> [tex]\alpha =5\%[/tex]
=> [tex]\alpha =0.05[/tex]
From the normal distribution table the critical value for [tex]\frac{\alpha }{2}[/tex] is
[tex]Z_{\frac{\alpha }{2} } =Z_{\frac{0.05 }{2} } = 1.96[/tex]
Generally the standard error is mathematically represented as
[tex]SE = \sqrt{\frac{\r p(1 - \r p)}{n} }[/tex]
=> [tex]SE = \sqrt{\frac{0.355(1 - 0.355)}{400} }[/tex]
=> [tex]SE = 0.0239[/tex]
Generally the margin of error is mathematically represented as
[tex]E = Z_{\frac{\alpha }{2} } * SE[/tex]
[tex]E = 1.96 * 0.0239[/tex]
[tex]E = 0.0469[/tex]
Generally the 95% confidence interval is
[tex]\r p - E < p < \r p + E[/tex]
=> [tex]0.355 - 0.0469 < 0.355 + 0.0469[/tex]
=> [tex]0.3081 < p<0.4019[/tex]
Considering the second question
The sample size is n = 500
The number of ads that use humor is k = 122
Generally the point estimate is mathematically represented as
[tex]\r p = \frac{k}{n}[/tex]
=> [tex]\r p = \frac{122}{500}[/tex]
=> [tex]\r p = 0.244[/tex]
Generally the standard error is mathematically represented as
[tex]SE = \sqrt{\frac{\r p(1 - \r p)}{n} }[/tex]
=> [tex]SE = \sqrt{\frac{0.244(1 - 0.244)}{500} }[/tex]
=> [tex]SE = 0.0192[/tex]
Generally the margin of error is mathematically represented as
[tex]E = Z_{\frac{\alpha }{2} } * SE[/tex]
[tex]E = 1.96 * 0.0192[/tex]
[tex]E = 0.0376[/tex]
Generally the 95% confidence interval is
[tex]\r p - E < p < \r p + E[/tex]
=> [tex]0.244 - 0.0376 < 0.244 + 0.0376[/tex]
=> [tex]0.2064 < p<0.2816[/tex]
Considering third question
Looking at the confidence interval in a(first question ) and b(second question) we see that the upper limit of both interval is not up to or greater than 0.5 i.e 50% hence the confidence intervals you computed in parts a and b does not suggest that a greater percentage of U.K ads uses humor
Susan has a part time job. She earns $7 an hour. She earns at most $143.50 a week. What is the greatest number of hours that she works?
Answer:
20.5 hours
Step-by-step explanation:
143.50/7=20.5
Hope this helps and can I have brainliest!
For the function f(x) = 7x-x^2 find each of the following;
a) f(t-4)
b) f(p + 4)
c) f(a+h) - f(a)
d) f(t-1)+c
e) f(a) + 8
Answer:
Step-by-step explanation:
in the expression f(x), x is just a place holder. It can be replaced with any value you choose.
f(t-4) = 7(t-4) - (t-4)^2
f(p+4) = 7(p+4) - (p+4)^2
f(a+h)-f(a) = 7(a+h)^2 - (a+h)^2 - (7a-a^2)
f(t-1)+c = 7(t-1) - (t-1)^2 + c
f(a)+8 = 7a - a^2 + 8
you can simplify these some
HI PLZ HELP I GIVE OUT BRAINIEST!
Answer:
A. 300
Step-by-step explanation:
Answer: 300 kilometers per hour
Step-by-step explanation: :)
Write and expression so that the quotient of a decimal and a whole number is 0.04
Answer:
0.4 divided by 10
Step-by-step explanation:
Answer: This is the result of 0.04/8
Step-by-step explanation
The table represents a function what is the value of f(-1)?
Answer:
0
Step-by-step explanation:
f(-1) is when x = -1
When x = -1, f(x) = 0.
A construction company is hired to build a wheelchair ramp for a restaurant. The ramp connects the handicap parking space (point A) to the top of the porch of the restaurant (point B) that is 4.5 feet higher than the ground level below it (point C making a right triangle ABC. The building regulations require the ramp angle to be 8 degrees, meaning angle A must be 8 degrees.
1. On a sheet of paper, draw the right triangle of the ramp and label the sides and angle A. Indicate which side is 4.5 ft.
2. Use the right triangle trigonometry and calculate the length of the ramp (sid AB). Show your work on the paper.
Answer:
1. diagram in the attachment
2. AB = 32.3 ft
Step-by-step explanation:
2. from the diagram:
[tex]sin \theta = \frac{opposite}{hypotenuse}\\sin (8) = \frac{4.5}{AB} \\AB = \frac{4.5}{sin(8)} \\AB = \frac{4.5}{0.1392} \\AB = 32.33ft[/tex]
if y varies directly with x and y=-20 and x=5 what is x when y=-24
Answer:
-21
Step-by-step explanation:
when y-20 and ×=5 you giving the answer -21 of x because the dividend variable would have to be subtracted from negative -20y from positive five
-2(8x-1)=5(1-3x)
What is the answer to this equation?
Answer:
x= -3
Step-by-step explanation:
−2(8x−1)=5(1−3x)
Step 1: Simplify both sides of the equation.
−2(8x−1)=5(1−3x)
(−2)(8x)+(−2)(−1)=(5)(1)+(5)(−3x)(Distribute)
−16x+2=5+−15x
−16x+2=−15x+5
Step 2: Add 15x to both sides.
−16x+2+15x=−15x+5+15x
−x+2=5
Step 3: Subtract 2 from both sides.
−x+2−2=5−2
−x=3
Step 4: Divide both sides by -1.
−x
−1
=
3
−1
x=−3
Given b(x) = |x+4| what us b(-10)?
Answer:
6
Step-by-step explanation:
b(x) = |x + 4|
b(-10) = |-10 + 4|
b(-10) = |-6|
b(-10) = 6
Best of Luck!
PLEASE HELP WILL GIVE BRAINLIEST <3
As Altitude ___?___ Temperature ___?___
A. Increases; Decreases
B. Decreases; increases
C. increases; increases
D. decreases; decreases
Answer:
A
Step-by-step explanation:
The higher you are the cooler it gets, that's why there's snow on mountains
Answer: A I think it's A
Step-by-step explanation:
Yesenia solved the equation shown below. Select the correct justification for each step shown.
Justification
Step
-4(3x - 1) = 12 – 4x
3.2 – 1= -3+2
Original Equation
3.2 +2=2
2 = -23
Addition Property of Equality
-1=2
GIVING BRAINLIEST
Answer:
Step-by-step explanation:
Yesenia's solution is as followed.
Step Justification
1). -4(3x - 1) = 12 - 4x 1). Original equation
2). 3x - 1 = -3 + x 2). Distributive property
3). 3x + 2 = x 3). Addition Property of equality
4). 2 = -2x 4). Subtraction property of equality
5). -1 = x 5). Division property of equality
bob charges 6.25 per hour for washing cars, If he works 8 1/2 hours a day, about how much money would bob make in a 5 day week?
Answer:
265.65
Step-by-step explanation:
6.25*8 =50
6.25/2=3.13
50+3.13=53.13
53.13*5=265.65
Answer:
$265.63 or ($265.625)
Step-by-step explanation:
So we wanna find out the total money bob would make :P
First we wanna see how much bob makes in a day
Bob works 8.5 hours a day and get 6.25 every hour:
With this info we can make the expression: 8.5 * 6.25 which equals 53.125
Then we wanna find out how much he makes in a 5 day week so:
We can make the equation 53.125 * 5 which equals 265.625
We can round 265.625 to 265.63
M+2 6 is equal to what?
Answer:
4
Step-by-step explanation:
I'm going to assume you mean [ m + 2 = 6 ]
m + 2 = 6
~Subtract 2 to both sides
m = 4
Best of Luck!
Martha's Bakery is baking loaves of banana bread and poppy-seed almond bread. The recipe for one loaf of banana bread calls for two cups of flour and one teasooon of baking soda. One loaf of poppy-seed almond bread reauires cups of flour and a teaspoons of baking soda. The bakery has 24 cups of flour and 26 teaspoons of baking soda in stock. Write a system of linear inequalities to model how many loaves of bread can be baked. graph the inequalities that represent how many loaves of each type of bread the bakers can make Which of the following combinations can they make based on their current supply of flour and bakine sodal Check all that apply.
01 banana bread and 5 poppy seed almond breaads
O3 banana breads and 11 poppy-seed almond breads
D 6 banana breads and 8 poppy seed aimond breads
D7 banana breads and 9 poppy-seed amond bre ads
09 banana breads and 5 poppy-seed almond breads
Answer: 1 banana bread and 5 poppy seed almond breads
6 banana breads and 8 poppy seed almond breads
Which equation can be used to find the value of b if side a measures 8.7 cm?
Answer:
D. 34.8+b=54.6
Step-by-step explanation:
Which statement could be used to explain why f(x) = 2x – 3 has an inverse relation that is a function?
1. The graph of f(x) passes the vertical line test.
2. f(x) is a one-to-one function.
3. The graph of the inverse of f(x) passes the horizontal line test.
4. f(x) is not a function.
Answer:
2. f(x) is a one-to-one function.
Step-by-step explanation:
If a relation passes the vertical line test, it is a function.
If a relation passes the vertical line test and the horizontal line test, then it is a one-to-one function, and its inverse is also a function.
Answer: 2. f(x) is a one-to-one function.
A stack of letters is 2.4 inches thick. Each letter is 0.6 inches thick.
How many letters are in the stack?
Answer:
4
Step-by-step explanation:
0.6 x 4 is 2.4
is (85.76%) an C or B
Answer:
It is B.
Step-by-step explanation:
A C is anything between 73-76 %, while a B is anything between 83-86 %
Each dance class is hour. It takes a student 7 hours to learn a dance routine. Which
statement is true?
A student needs to take 6 dance classes to learn the routine.
A student needs to take 10 dance classes to learn the routine.
A student needs to take 5 dance classes to learn the routine.
A student needs to take 9 dance classes to learn the routine.
Done
Answer:
The correct option is (d) a student needs to take 10 dance classes to learn the routine.
Step-by-step explanation: Given that each dance class is hour and a student takes hours to learn a dance routine.
We are to select the TRUE statement.
Duration of each dance class is given by
and the time taken by a student to learn a dance routine is given by
Therefore, the number of dance class that a students needs to learn the dance routine will be
Thus, a student needs 10 dance classes to learn the dance routine.
Option (d) is CORRECT.
Step-by-step explanation:
Find the measure of x help asap
Answer:
M<XQL=118°
Step-by-step explanation:
209-13b=146-4b
209-146=-4b+13b
63=9b
b=7
<XQL=209-13b=
209-13(7)=
209-91=
118
- 9x + 10
-5x = —————
7
Answer:
x = [tex]\frac{17}{14}[/tex]
Step-by-step explanation:
simplify both sides of the equation
-9x + 10 - 5x = - 7
-9x + 10 + - 5x = -7
(-9x + -5x) + (10) = -7 (combine like terms)
-14x + 10 = -7
subtract 10 from both sides
-14x + 10 - 10 = -7 - 10
-14x = -17
divide both sides by -14
[tex]\frac{-14x}{-14}[/tex] = [tex]\frac{-17}{-14}[/tex]
x = [tex]\frac{17}{14}[/tex]
How do you write -10.2 as a fraction?
22. The sum of the first n terms of the arithmetical progression 3, 5.5, 8. .... is equal to the 2nth term of the arithmetic
progression 33/2, 57/2, 81/2. calculate n
[I.S.C
Given that,
Series 1: 3, 5.5, 8..... and series 2: 33/2, 57/2, 81/2.
To find,
The value of n.
Solution,
Let n is the no of terms in both the series.
For 3, 5.5, 8
First term, a = 3 and common difference d = 2.5
Sum of n terms of a series is given by :
[tex]S=\dfrac{n}{2}(2a+(n-1)d)[/tex]
So,
[tex]S=\dfrac{n}{2}(2\times 3+(n-1)2.5)\\\\S=\dfrac{n}{2}(6+2.5(n-1))\ ....(1)[/tex]
For 33/2, 57/2, 81/2
First term, a = 33/2 and common difference, d = 12
nth term of a series is given by :
[tex]a_n=a+(n-1)d[/tex]
For 2nd terms,
[tex]a_2=\dfrac{33}{2}+(2-1)\times 12\ ....(2)[/tex]
According to question, sum of the first n terms of the arithmetical progression 3, 5.5, 8. .... is equal to the 2nth term of the arithmetic progression 33/2, 57/2, 81/2
From equation (1) and (2) :
[tex]\dfrac{n}{2}(6+2.5(n-1))=\dfrac{33}{2}+ 12\\\\\dfrac{n}{2}(6+2.5(n-1))=\dfrac{57}{2}\\\\n(6+2.5(n-1))=57\\\\6n+2.5n^2-2.5n-57=0\\\\2.5n^2+2.5n-57=0\\\\\text{On solving the above quadratic equation, we get the value of x as follows :}\\\\x=4.126,-5.526[/tex]
Neglecting the negative value, we get the value of n = 4.126
or
n = 4
Hence, the value of n is 4.
Need help with this please.
Answer:
(-oo, 3] or (7, +oo)Step-by-step explanation:
Given
x ≤ 3 or x > 7Same in interval notation
(-oo, 3] or (7, +oo)Isaiah is starting his own gardening business. Isaiah thinks he will do a better job than his competitors, so he thinks he can charge $15.50 per hour. If he knows he will only be able to work 35 hours per week, how much money will he earn each week?
Answer:
$542.50
Step-by-step explanation:
Isaiah's weekly earnings will be ...
($15.50 /h)(35 h/wk) = $542.50 /wk
Can someone help me fast please!!!!
Answer:
Step-by-step explanation:
121=irrational
100= rational
99= irrational
10=rational
What's the nearest integer and the nearest tenth
Answer:
nearest integer 27 by 4
An awards dinner costs $225 plus $5 for each person making reservations. The total bill is $735. How many people attended the dinner?
Answer:
102 people
Step-by-step explanation:
Hope this helps :-)
How do you do this question?
Answer:
Converges
Step-by-step explanation:
g(x) = 1/eˣ = (1/e)ˣ
This is a geometric series. │1/e│< 1, so the series converges.
f(x) = 1 / (√x + eˣ), so f(x) < g(x). Therefore, if g(x) converges, then f(x) also converges.