Question

Which function represents exponential decay?

a)y=14(0.95)^x
b)y=14(1.95)^x
c)y=14x^1.95
d)y=14/0.95
​

Answer 1

a

Explanation:

We are looking for an exponential function
`y=a(r)^x` where r is less than 1.

a works because it is in the form
`y=a(r)^x` where r is less than 1.

b is in the form
`y=a(r)^x` but r is more than 1.

c. and d. are not even exponential functions.

c. is a polynomial

d. is a constant polynomial (no variable)