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.
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Answer:
1.46 times
Step-by-step explanation:
The growth,
rate is defined as Return on Equity times (1-Dividend payout ration):

Given that 
The total asset turnover is calculated as:

#We know that

Hence, turn-over required for a 7.1% internal growth is 1.4564times
Answer:
3.40 rad
Step-by-step explanation:
it is the same denominator therefore only the numerators are added and the sign is maintained. The answer is -12/9 but it can be reduced to -4/3.
I’m so confused what are u trying to ask