Find the real solution

x^4-x^3+2x^2-4x-8=0

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 in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

Which of the following graphs could represent a cubic function?

Which expression is equivalent to 64 - 9x^2?