Question

Without graphing, how do you determine whether each equation `Y=72(1.6)^x` represents exponential growth of exponential decay?

Answer 1

`1.6>1` so every time you raise it to the power `x` (increasing) it gets bigger:
For example:
if `x=0 -> 1.6^0=1`
and if `x=1 -> 1.6^1=1.6>1`
Already increasing `x` from zero to 1 made your value increase!
This is a growth!