Answer:
Instructions are below.
Step-by-step explanation:
<u>To calculate the final amount if a given substance, we need to use the following formula:</u>
final amount= initial amount / (2^n)
n= elapsed time / half-life
For 20 years:
n= 20/10= 2
Final amount= 200/(2^2)
Final amount= 50 grams
For 60 years:
n= 60/10= 6
Final amount= 200/ (2^6)
Final amount= 3.125 grams
<u>To calculate the elapsed time it is more complicated:</u>
elapsed time= ln(ending amount/beginning amount) / (-decay constant)
ln= natural logarithm
decay constant= ln(2) / half-life
decay constant= 0.0693
elapsed time= ln(1.03/200) / (-0.0693)
elapsed time= 76.028
Prove:
n= 76.02/10= 7.602
Final amount= 200/(2^7.602)= 1.03 grams
Step-by-step explanation:
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- Width of a rectangle ( w ) = 7t - 1.5 ft
- Length of a rectangle ( l ) = 1.5t + 8 ft
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- Perimeter of the rectangle
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8 1/3 is equivalent to 25/3
2 2/3 is equivelent to 8/3
25/3-8/3 so you take away 8 from 25 and you get, 17 therefore, the answer is 17/3 or 5 2/3.
Hope this helped.
Have a nice day.
Answer:
(7 ÷ x) - 1
Step-by-step explanation:
i tried, i tried
