-5(-2) equals what? I’m confused please help just answer!!

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.

Evaluate the expression. (9 + 5)(3 + 2)0

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25