Question

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

Answer 1

f(x)=3/2(8/7)^-x

Explanation:

If you turn the fractions into decimals (
`(3)/(2)((8)/(7) )`^-x = 1.5(1.14)^-x), put that number into y= in your graphing calculator and press graph you will be able to see, verses the other functions, that the line decreases.

Answer 2

Answer: c

Explanation: