Anyone age 16-17 wanna talk my lonely ahh need help with life

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

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function