Question

Two years ago, Marc bought a new cell phone. His purchase price was $750. The value of the phone for the next 2 years was $637.50 and $541.88, respectively. Find the exponential function that represents the value of Marc’s phone t years after it was purchased.(1 point)

f(t)=637.50⋅0.85t


f(t)=750⋅0.85t


f(t)=750⋅0.85t


f(t)=750⋅1.15t

Answer 1

f(t) = 750*(0.85)^t

Reason: r = 637.50/750 = 0.85, so f(t)=750·0.85^t (and f(2)=750·0.85^2=541.88).