Choose the one alternative that best completes the statement or answers the question.
-A particular substance decays in such a way that it loses half its weight each day. How much of the substance is left after 7 days if it starts out at 16 grams?
A) 4 grams
B) $\frac { 1 } { 8 }$ gram
C) $\frac { 1 } { 4 }$ gram
D) 8 grams

Question

Choose the one alternative that best completes the statement or answers the question.
-A particular substance decays in such a way that it loses half its weight each day. How much of the substance is left after 7 days if it starts out at 16 grams? 
A) 4 grams
B) $\frac { 1 } { 8 }$ gram
C) $\frac { 1 } { 4 }$ gram
D) 8 grams

Quizplus · Accepted Answer

After 7 days, the substance halves its weight 7 times, starting from 16 grams. This is calculated as $16 \times (\frac{1}{2})^7 = 16 \times \frac{1}{128} = \frac{1}{8}$ gram.

Choose the One Alternative That Best Completes the Statement or Answers