If x+1 and x-1 are the factors of the polynomial ax^3 + x^2 - 2x +b, find the values of a and b

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

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle