Nonlinear Functions

SAT Math· difficulty 3/5

A radioactive sample has a half-life of 5 years. If 80 grams are present today, how many grams remain in 15 years?

A
$20$
B
$5$
C
$10$
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D
$40$

Explanation

80 \cdot (1/2)^3 = 80/8 = 10

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