Last one i promise lol #15 need as soon as possible

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

If f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01