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3 years ago

What number is 20 more than 137?

Mathematics

1 answer:

bija089 [108]3 years ago

3 0

You just do 137 + 20 = 157?

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I need help with this thank you

kari74 [83]

1= 5/4

2= -103/40

1st explanation

-12/15 + 4/5 + 7/12

-8 + 48 + 35/60

75/60

5/4

2nd explanation

-1 3/5 + 5 1/8 - 6 1/10

-8/5 + 41/8 + 61/10

- 64 + 205 + 244 / 40

-103/140

-103 / 40

8 0

3 years ago

Find the area of a space figure is its a rectagle with triangle on each end

vladimir1956 [14]

Formula for surface area of a triangular prism: bh+2ls+lb
(7*4)+2(8*5)+(8*7)
28+80+56
=164 cm^2

5 0

3 years ago

A triangle drawn on a Cartesian plane has vertices p(-10,-2) Q(-10,6) and R(5,2). Calculate the perimeter,in units of the triang

lakkis [162]

Answer:

1 is a great place to work for and it is a great place to work for

Step-by-step explanation:

The Frog and the Ox are a great place to work for and it

4 0

3 years ago

A square is inscribed in a circle of diameter 12 millimeters. What is the area of the shaded region? A square is inscribed in a

bezimeni [28]

Answer: A. (72π - 144) mm²

<u>Step-by-step explanation:</u>

$A_{shaded}=A_{circle}-A_{square}\\\\\\A_{circle}=\pi \cdot r^2\\.\qquad \ =\pi \bigg(\dfrac{12\sqrt2}{2}\bigg)^2\\\\.\qquad \ =\pi (6\sqrt2)^2\\.\qquad \ =72\pi\\\\\\A_{square}=side^2\\.\qquad \quad =\dfrac{12\sqrt2}{\sqrt2}^2\\\\.\qquad \quad =12^2\\\\.\qquad \quad =144\\\\\\\large\boxed{A_{shaded}=72\pi-144}$

7 0

3 years ago

A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only

Semenov [28]

Answer:

Step-by-step explanation:

Hello!

The variable of interest is:

X: Number of people that support the candidate.

You need to calculate the sample size to estimate the population proportion of supporters given a confidence level of 99% and a margin of error of 4%

The margin of error of the confidence level for the population proportion is

d= $Z_{1-\alpha /2}$ * $\sqrt{\frac{p'(1-p')}{n} }$

From this formula you have to clear the value of n:

$\frac{d}{Z_{1-\alpha /2}}$ = $\sqrt{\frac{p'(1-p')}{n} }$

$(\frac{d}{Z_{1-\alpha /2}})^2$ = $\frac{p'(1-p')}{n}$

$n*(\frac{d}{Z_{1-\alpha /2}})^2$ = $p'(1-p')$

n= $p'(1-p') * (\frac{Z_{1-\alpha/2}}{d} )^2$

$Z_{1-\alpha/2}= Z_{0.995}= 2.586$

sample proportion "p'" since there is no sample information, nor any previous information is known, you have to consider it as the "worse case scenario" and use the value of p'= 0.50

d= 0.04

$n= p'(1-p') * (\frac{Z_{1-\alpha/2}}{d} )^2= 0.5*0.5*(\frac{2.586}{0.04} )^2= 1044.9= 1045$

She has to take a sample of 1045 people to estimate the population proportion of her supporters with a confidence level of 99% and a margin of error of 4%

I hope this helps!

4 0

3 years ago