Im having trouble with these two questions, can anyone help please, thank you!

QUESTION #4: [APPLICATION] [A5] 1. Unit 8: A $5000 investment is made in a savings account that pays 10%/a compounded quarterly. How long will it take for the investment to grow to $7500? 2. The function f(x) = 0. 00056(3x + 2)" + 1 models the Harrington Paper Company's revenue, where x is the time measured in weeks and f(x) is the revenue measured in thousands of dollars. At what rate was the company's revenue growing from week 50 to week 75