Timothy purchased a computer for $1,000. The value of the computer depreciates by 20% every year.

This situation represents [a.) exponential decay, b.) exponential growth]

The rate of growth or decay, r, is equal to [c.) 0.8, d.) 1.2, e.)0.2
year.

So the value of the computer each year is [f.) 20 %, g.) 80%, h.) 120%] of the value in the previous year.

It will take [i.) 3, j.) 2, k.) 4, l.) 5.] years for the value of the computer to reach $512.