Which of the following functions is an example of exponential growth?f(x)=5(0.5)xf of x is equal to 5 times 0 point 5 to the x th powerf(x)=−100.5xf of x is equal to negative 10 raised to the 0 point 5 x powerf(x)=12ex−2f of x is equal to 1 half e raised to the x minus 2 powerf(x)=42−x