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ki77a [65]
3 years ago
11

Jamal ran 8 kilometers sprinted 500 meters and climbed bleachers for a distance of 1.5 kilometers during track practice. How man

y meters in total did he travel during practice?
Mathematics
1 answer:
Sindrei [870]3 years ago
7 0

Answer:

Total distance traveled = 10000 meters

Step-by-step explanation:

1000 meters = 1 kilometers

Hence 8 kilometers = 8000 meters and 1.5 kilometers = 1500 meters

Total distance traveled = 10000 meters

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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
How many 2 1/2 acre plots can be made out of a 35-acre field
Hoochie [10]

35 divided by 2 1/2

change 2 1/2 to an improper fraction

2 1/2 = 5/2

35 divided by 5/2

copy dot flip

35 * 2/5

70/5

14  

you can make 14 plots

4 0
3 years ago
What is 3w(2+4x-5+y)
Mkey [24]

Answer:

-9w+12wx+3wy

Step-by-step explanation:

just distribute 3w through the parentheses

3 0
3 years ago
Compute.
Sholpan [36]
<span>6 yr 7 months+ 2 yr 11 months = ?
6 yr + 2 yr = 8 yr

7 months + 11 months = 18 months = 1 yr 6 months

8 yr + </span>1 yr 6 months = 9 yr 6 months

answer is C<span>. 9 yr 6 months</span>
8 0
3 years ago
Can someone help me answer this
VikaD [51]
C



Your welcome lolololololol


8 0
3 years ago
Read 2 more answers
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