Answer:
rotate 180 degrees ccw from (0,0)
36 walls can be painted in 8 hours. 4 1/2 times 8 = 36
4 1/2 + 5 5/6 is the equation
First do 10.65 - 4.25
so 6.4
then multiply 4 by 16 to find the ounces
so 64
then divide 6.4 by 64
so .1
they were charged 10 cents per ounce