Name: SAT Math Help & School Math Mastery
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#15138

functions

exponential

applications

medium

75 sec

A certain substance decays at a rate of $5%$ per hour. If you start with $500$ grams of the substance, which of the following equations best models $A$ , the amount of the substance in grams, $t$ hours after the decay begins?

A.

$A = 500 (0.05)^{t}$

B.

$A = 500 (0.95)^{t}$

C.

$A = 500 (1.05)^{t}$

D.

$A = 500 (0.5)^{t}$