PLEASE HELP ASAP 50 POINTS Which equation represents an exponential function with an initial value of 500?

A: f(x) = 100(5)x
B: f(x) = 100(x)5
C: f(x) = 500(2)x
D: f(x) = 500(x)2

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?