Check Your Understanding
1. Use the function y = 100(0.2)x to find the missing value in the table below.
x y
-2 2,500
-1 500
1 20
4 ?
i don't understand how you find it
You must have meant:
y = 100(.2)^x
so just plug in x = 4
Use you calculator, you can check how they got the first 3 values, and then do the same thing with x = 4