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3 years ago

Round off 3.55 to one significant figure

Mathematics

1 answer:

aivan3 [116]3 years ago

8 0

Well I Think it is 4 because it says round off

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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

Solve the following problem. 9/11+3/4=

Liono4ka [1.6K]

Answer:

Exact form: 69/45

Decimal form: 1.5681 **repeating**

Mixed Number form: 1 25/44

Step-by-step explanation:

Brainliest please

3 0

3 years ago

Read 2 more answers

Evaluate for x = 2. A. 4 B. 5 C. 6 D. 7

kakasveta [241]

I hope that A. Is the answer

7 0

3 years ago

Nick can type 30 words a minute. How many words can be typed in 9.5 minutes?

iren [92.7K]

Answer:

285 Words

Step-by-step explanation:

If in 1 minute he can type 30 words , then in 9.5 min he can type 30 x 9.5 = 285.0 = 285

So, Nick can type 285 words in 9.5 minutes.

Hope this Helps!

7 0

3 years ago

145 300 610 1230

Vlad1618 [11]

Multiplying by 2 and then adding 10 145*2=290+10=300
300*2=600+10=610
610*2=1220 + 10=1230
x=2 y=10
x+y=12

5 0

4 years ago