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2 years ago

Which of the following is NOT a benefit of swimming?

Mathematics

2 answers:

USPshnik [31]2 years ago

8 0

|*~Hey sisters its Alejamtz555 here!~*|

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{Answer}

D. Burn less than 400 calories per hour.

Hope this helps! <3

Anna71 [15]2 years ago

4 0

Answer:

d on edge

Step-by-step explanation:

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The core melt- down and explosions at the nuclear reactor in Chernobyl in 1986 released large amounts of strontium-90, which dec

elena-14-01-66 [18.8K]

If $S(t)$ is the amount of strontium-90 present in the area in year $t$ , and it decays at a rate of 2.5% per year, then

$S(t+1)=(1-0.025)S(t)=0.975S(t)$

Let $S(0)=s$ be the starting amount immediately after the nuclear reactor explodes. Then

$S(t+1)=0.975S(t)=0.975^2S(t-1)=0.975^3S(t-2)=\cdots=0.975^{t+1}S(0)$

or simply

$S(t)=0.975^ts$

So that after 50 years, the amount of strontium-90 that remains is approximately

$S(50)=0.975^{50}s\approx0.282s$

or about 28% of the original amount.

We can confirm this another way; recall the exponential decay formula,

$S(t)=se^{kt}$

where $t$ is measured in years. We're told that 2.5% of the starting amount $s$ decays after 1 year, so that

$0.975s=se^k\implies k=\ln0.975$

Then after 50 years, we have

$S(50)=se^{50k}\approx0.282s$

5 0

3 years ago

Show twelve in four different ways use words pictures and numbers

Hunter-Best [27]

24/4: 24-12: 12+0: 12/1: 48/4: 72/6:

3 0

3 years ago

What is 0.353 rounded to the nearest tenth

KengaRu [80]

0.4 .

Explanation
Rounding to the tenth, you look at the 2nd number after the period, if it’s greater than 5 or 5 itself u and 1 to the first number after the period. Back to the question 0.353 , the 2nd number after the period is 5, so u add 1 to the 1st number after the period with it’s 3 and 3+1=4. If you are rounding to tenth only leave one number after the period with gives you 0.4. Hopefully you get it.

4 0

2 years ago

How much longer is a 1 inch button than 3/8 inch button

KengaRu [80]

3/8+x=1

x=5/8

A 1 inch button is 5/8 inches longer than a 3/8 inch button.

3 0

2 years ago

9(2w−y)=21w−9y Solve for y

valentinak56 [21]

9(2w−y)=21w−9y