How do you find the amount of time?

I=$54, P=$800, r=4.5%

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?