Find each sum.
17+(-28
12+(-9)
-2+7
-14+(-10)
-9+(-2)

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

Answer this question only if you know the answer! 30 points and

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.