Name: SAT Math Help & School Math Mastery
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#17385

exponential

functions

hard

180 sec

Calculator OK

For the exponential function $f$ , the value of $f (1)$ is $k$ , where $k$ is a constant. Which of the following equivalent forms of the function $f$ shows the value of $k$ as the coefficient or the base?

A.

$f (x) = 50 (1.6)^{x + 1}$

B.

$f (x) = 80 (1.6)^{x}$

C.

$f (x) = 128 (1.6)^{x - 1}$

D.

$f (x) = 204.8 (1.6)^{x - 2}$