Worth 10 points please help me ASAP

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?