Find unit rate ASAP

Please

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.

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Find the distance between (7,-6) and (-3,-9)