What is the mZACB?
10°
50°
90°
180°
|(7x - 20)

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

Find the area of a parallelogram with the given vertices. p(-2, -5), q(9, -5), r(1, 5), s(12, 5)

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10