Hi can you help with this within an hour I have been really confused thank you very much.

2. The function f(x) = 0.000 56(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? [2]