1. To build the walls on the two outside corners of the bedroom, your cousin wants to use sheets of dry wall that are each x in length. How many sheets of dry wall will you need for the two outside walls of the bedroom?

z/xy  where z units squared is the total area of the two outside walls and xy is the area of one sheet.

Step-by-step explanation:

First find the area of a single sheet as;

Length of the sheet is x units

Assume the width of the sheet to be y units

The area of the sheet will be : x* y = xy units squared.

Second, find the total area of the two outside corners walls of the bedroom.

Lets say the total area of the two outside walls is z units squared.

Then to get number of sheets of dry wall you need for the two outside walls of the bedroom will be;

= Total area of the two outside walls / The area of  one sheet

= z/xy

Use real values for x, y and z to find the actual number of sheets required for the two outside corners walls of the bedroom.