Question

Which function is increasing?O A. f(x) =-GOB. f(x) =-COO c. Rx) = 4O D. f(x) = (0.4)

Answer 1

Recall that an exponential function:

$f(x)=k^x,$

is increasing if k>1 and decreasing if 0

Therefore:

$f(x)=(\frac{1}{4})^x,\text{ }f(x)=(\frac{1}{2})^x,\text{ and }f(x)=(0.4)^2$

are decreasing functions and

$f(x)=4^x$

is an increasing function.

Answer: Option C.