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3 years ago

Brainlist answer!!Can I get some help with this, please!!

1 answer:

4 0

A) The question would be "Does cell phone use time correlate to brain cancer?". The population is all cell phone users. The sample is the 469 people with brain cancer, and the 422 healthy people.

B) This sample size may not portray the entire population of users because the positive results may have been fabricated by factors other than cell phone use. You would have to figure out the population size and determine the correct sample size.

C) This study may not portray cell phone use correlation over a large population efficiently because of the sample size and the predetermined conclusion that cell phone use causes cancer.

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Rewrite each ratio in simplest form 8:24 and 7:21

jenyasd209 [6]

Answer:

Step-by-step explanation:

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5 0

3 years ago

The radius of a right circular cone is increasing at a rate of 2 inches per second and its height is decreasing at a rate of 4 i

irina [24]

Answer:

The volume of cone changing at rate $\frac{400}{3}\pi in^3/s$

Step-by-step explanation:

Let r be the radius of cone and h be the height of cone

$\frac{dr}{dt}=2 in/s$

$\frac{dh}{dt}=-4 in/s$

We have to find the rate at which the volume of cone changing when r=10 in and h=20 in

Volume of cone

$V=\frac{1}{3}\pi r^2 h$

Differentiate w.r.t t

$\frac{dV}{dt}=\frac{1}{3}\pi (2rh\frac{dr}{dt}+r^2\frac{dh}{dt})$

Substitute the values

$\frac{dV}{dt}=\frac{1}{3}\pi(2\times 10\times 20\times 2+(10)^2\times (-4))$

$\frac{dV}{dt}=\frac{1}{3}\pi(400)=\frac{400}{3}\pi in^3/s$

Hence, the volume of cone changing at rate $\frac{400}{3}\pi in^3/s$

4 0

3 years ago

What is twice 2 to the 30 power ? Write using exponents. Explain your reasoning

Rus_ich [418]

2 times 2^30 simple means that = (2^1) x (2^30)

In multiplying numbers of the same base (in this case 2), the exponents are just added, therefore giving us:

(2^1) x (2^30) = (2^31)

Answer:

2 to the 31 power

4 0

3 years ago

Read 2 more answers

Use the expression 14X + 28Y + 21.. what is the greatest common factor

12345 [234]

Answer:

Step-by-step explanation:

None of these numbers are alike terms so the only number left is 1.

4 0

3 years ago

What is 3 1/4 + 2 1/8 A) 5 1/6 B) 5 3/8 C) 5 1/2 D) 5 3/4

love history [14]

Answer:

The correct answer would be B.

Step-by-step explanation:

3 1/4 + 2 1/8

= 13/4 + 17/8

= 43/8

= 5 3/8

Hope this helps!

5 0

4 years ago