Need answer fast what is the midpoint of the line segment whose endpoints are (-8, 12) and (-13, -2)? (-10.5, 5) (-10.5, 7) (-2.5, 7)

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

How to simply and write the answer n a whole number

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms