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SAT Math Practice Question #35008 - SATify | SATify

#35008

applications

functions

exponential

medium

60 sec

A radioactive substance has an initial mass of 80 grams. It decays at a rate of 7% per year. Which function $M (t)$ best models the mass of the substance remaining after $t$ years?

A.

$M (t) = 80 (0.07)^{t}$

B.

$M (t) = 80 (0.93)^{t}$

C.

$M (t) = 80 (1.07)^{t}$

D.

$M (t) = 7 (80)^{t}$