Answer:
Answer = 
Step-by-step explanation:
Step 1:-
simplifying 

base are equal powers are added
on simplification 
Q. The area of David's living room is 18.087 square yards, and their bedroom has an area of 15.78 square yards.Round to the nearest tenth and estimate the amount of carpet they need to buy. PLZ HELP!!
A. 33.867 and rounded is 33.9