To determine which function represents exponential decay, examine the base of the exponent. For exponential decay:
Base 0 < b < 1: The function shows exponential decay because y decreases as x increases.
A.
Base: 5 (greater than 1)
Behavior: Exponential growth. y increases as x increases.
B.
Base: (greater than 1)
Behavior: Exponential growth. y increases as x increases.
C.