For what values of x will the polynomial P(x)=-2x^3 +cx^2-5x+2 have the same remainder when it is divided by x-2 and x+1

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.