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)=((1)/(4))^x,\text{ }f(x)=((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.