Explain how to write and solve an equation to find an unknown side length of a rectangle when given the perimeter

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Bring the fraction a/a-4 to a denominator of 16-a^2