Question

Determine whether y=2(9/10)× represents exponential growth or decay

Answer 1

If the base that is being raised to a power is less than one then decay is at work.

Answer 2

Right, so when you have

\[2(\frac{ 9 }{ 10 })^x\]

your base...(9/10) is smaller than 1...so decay happens...whereas if your base was some number > 1 ... growth would happen