How to solve the hypotenuse on a 30-60-90 triangle

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

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents