Question

Wendy enjoys listening to hip hop and downloads music regularly from the internet. She already has four hours of hip hop in her collection. From the second month onward, the number of hours of hip hop music she downloads each month is nine percent greater than the number of hours of hip hop music she had downloaded the previous month. Which function best shows the total number of hours of hip hop music Wendy has in her collection f(x) after x months?

f(x) = (1.09)^x + 3

f(x) = 3(1.09)^x

f(x) = (1.09)^x + 2

f(x) = (1.09)^x - 2

Answer 1

If you just want to quickly solve it, with the given options:

When x=0, the function must equal to the number of hours she started with (four) - plug in x=0 and see which will give f(0) = 4

Answer 2

Only one of them will.

Answer 3

the first one I think??