Answer:
well using your equation p - 18 = 0.85p the answer is p = 120
when u apply p = 120 to your equation
(120) - 18 = 0.85(120)
simplify
102 = 102
I hope this helps you
Step-by-step explanation:
121 books
bc that equals 11 so there are 11 squares plus the two missing ones from before so u do 11x11 which would be 121
hope this helps :>