Question

I NEED THIS ASAP PLEASE

Answer 1

Answer:

Step-by-step explanation:

This is modeled after an exponential function which, at its simplest, is

$y=a(b)^x$ where, for us and in this particular situation, y is the final height, a is the initial height, b is the rate of growth or decline, and x is the number of bounces. We know the initial height is 20, but we need to find the rate of decline. Rewriting the formula to model a rate of decay or decline is

$y=a(1-r)^x$, or more closely related to our circumstances:

$H=20(1-.8)^n$ and simplifying that a bit:

$H=20(.2)^n$, choice D.