(9 + r) – (r + 10) please help me simplifying

What is the area of a pizza with a radius of 40 cm leave the answer in terms of π to find your exact answer 40π cm² 1600π cm² 800π cm² 80π cm² π=pi

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Select the point that is a solution to the system of inequalities. y< =-x+3 y=x^(2)-3x