-3/4 plus -8/9 Step by step instructions needed please, will make if I can and no useless answer!

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

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite