Name: SAT Math Help & School Math Mastery
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#36451

applications

functions

exponential

easy

45 sec

A certain radioactive substance decays such that its mass is halved every 10 years. If a sample initially has a mass of 800 grams, which function $M (t)$ models the mass of the substance, in grams, after $t$ years?

A.

$M (t) = 800 (0.5)^{t}$

B.

$M (t) = 800 (0.5)^{\frac{t}{10}}$

C.

$M (t) = 800 (2)^{t}$

D.

$M (t) = 800 - 0.5 t$