Which is an exponential decay function?

f(x)= 3/4(7/4)^x
f(x)= 2/3(4/5)^-x
f(x)=3/2(8/7)^-x
f(x)=1/3(-9/2)^x

Step-by-step explanation:

An exponential decay function is of the form:

, where .

Or , where

The coefficient 'a' can be any non-zero real number.

is an exponential decay function, because it meets our first definition.

, is not an exponential decay function.

, is an exponential decay function, because it meets our second definition.

is also NOT an exponential decay function.

the anwser is d) 75°

step-by-step explanation: