Hello There =)
Commutative property is used. The commutative property <span>states that two numbers can be multiplied in either order.</span>
45m+10n-30m
15m+10n
I believe this is right.
Split the room into 2 rectangles
area = 5*4 + 3*3 = 29 sq ft
So the cost is 29*8 = $232
