4x – 20 = -18
Can you help me with this

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.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex