Question

Which equations model exponential growth?

Select each correct answer.



​A) y=4.2(1.25)x ​

B) ​​ y=0.25(2)x ​ ​

C) y=0.55(0.91)x

​ D) y=2(0.20)x ​

Answer 1

​A) y=4.2(1.25)x ​

B) ​​ y=0.25(2)x ​

Explanation:

Answer 2

P = A(1+r)^x

where P is the population at time x
A is the initial population and r is the growth/decay rate. Growth will be +positive r number added to the 1. Where as decay subtracts r. So any answers that are > than 1 which is answers A and B.