the weight of the substance after 28 years is 8 grams.
<h3>How to determine the amount</h3>
We have that the half life of a substance is defined as the time required for the substance to decrease by half
The formula for calculating the half - life of a material is given as;

Where
- N(t) is final amount
- No is the initial amount = 128 grams
- t1/2 is the half life = 7 years
- t is the time elapsed = 28 years
Substitute into the formula
N(t) = 128 × (0. 5) ^28/ 7
N (t) = 128 × ( 0. 5) ^ 4
N(t) = 128 × 0. 0625
N(t) = 8 grams
Thus, the weight of the substance after 28 years is 8 grams.
Learn more about half life here:
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I don’t know to be honest
Answer:
So you know this picture is a function so it cannot be a or b. The answer is C.
Step-by-step explanation:
A c tv yo TV tctuyrx urxfixufxitcufxgi gixifcit
Answer:
Salesman A made $569.1 more commission than salesman B
Step-by-step explanation:
(11/100)*67530= (amount made by salesperson A)
=7428.3
(8/100)*85740= (amount made by salesperson B)
=6859.2
A-B= 569.1
Hope this helps :D