Name: SAT Math Help & School Math Mastery
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#30743

applications

functions

exponential

medium

60 sec

The number of bacteria in a culture is modeled by the function $N (d) = 200 (1.5)^{d}$ , where $d$ is the number of days. Which of the following functions best models the number of bacteria $w$ weeks after the initial observation?

A.

$N (w) = 200 (1.5)^{w}$

B.

$N (w) = 200 (1.5)^{w /7}$

C.

$N (w) = 200 (1.5)^{7 w}$

D.

$N (w) = 200 (1.5)^{w + 7}$