Question

Which is an exponential decay function?
f(x)= 3/4(7/4)^x
f(x)=2/3(4/5)^-x

Answer 1

Answer:

none of them is an exponential decay function

Step-by-step explanation:

An exponential decay function is of form

f(x)=a(b)^x where b<1

f(x)=3/4(7/4)^x is obviously increasing

f(x)=2/3(4/5)^-x

=2/3(5/4)^x which is again increasing