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hjlf
3 years ago
15

Help me please please!!!!!!!!

Mathematics
1 answer:
vova2212 [387]3 years ago
6 0

Answer:

a

Step-by-step explanation:

The circumference (C) of a circle is calculated as

C = 2πr ( r is the radius ) , then

C = 2π × 20 = 40π

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Will give 20 points if you answer correctly, will give brainliest! Please answer and EXPLAIN! Thanks
Sergeu [11.5K]

Answer: B

Step-by-step explanation:

so for the slope to be parallel, it means it's the same slope as the given equation which is -5

using point slope, we can write a new equation

y -5 = -5(x+3)

y -5 = -5x-15

y = -5x-10

5 0
3 years ago
At camp, ¼ of the children are divided into 3 equal groups for crafts. What fraction of the children at camp are in EACH group?
zloy xaker [14]

Answer:

3/4?

Step-by-step explanation:

maybe not but i think this is it

7 0
3 years ago
Read 2 more answers
1. Mary is making a necklace by alternating red, yellow, and green beads. In
Feliz [49]

Answer:    20/ 60 = 1/3

Step-by-step explanation:

60 beads in total which makes that the denominator and how many red beads in the numerator (20) then just reduce the fraction

6 0
3 years ago
Two different simple random samples are drawn from two different populations. The first sample consists of 20 people with 9 havi
QveST [7]

Answer: (-0.48,\ -0.04)

Step-by-step explanation:

The confidence interval for the difference of two population proportion is given by :-

(p_1-p_2)\pm z_{\alpha/2}\sqrt{\dfrac{p_1(1-p_1)}{n_1}+\dfrac{p_2(1-p_2)}{n_2}}

Given : The first sample consists of 20 people with 9 having a common attribute.

Here, n_1=20 , p_1=\dfrac{9}{20}=0.45

n_2=2100 , p_1=\dfrac{1492 }{2100}\approx0.71

Significance level : \alpha=1-0.95=0.05

Critical value : z_{\alpha/2}=1.96

A 95% confidence interval for the difference of two population proportion will be :-

(0.45-0.71)\pm z_{\alpha/2}\sqrt{\dfrac{0.45(1-0.45)}{20}+\dfrac{0.71(1-0.71)}{2100}}\\\\\approx -0.26\pm0.22\\\\=(-0.26-0.22,-0.26+0.22)\\\\=(-0.48,\ -0.04)

3 0
4 years ago
What is 1/4 divided by -1/2?
Sergio039 [100]

Answer:

1/2

Step-by-step explanation:

KEEP 1/4 CHANGE the sign to multiplication FLIP 1/2 to 2/1

new equation: 1/4 x 2/1

now we can solve

we do: 1 x 2= 2

so 2 is our nominator

then we do: 4 x 1= 4

so 4 is our denominator

combine the nominator and denominator and we get

1/2 which in decimal form is 0.5

3 0
3 years ago
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