6minus startfraction 3 over 4 endfraction x plus startfraction 1 over 3 endfraction equals startfraction one-half endfraction x plus 5.x + 5

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box