Which expression is the factorization of x2 + 10% + 21?
(x + 3)(x + 7)
(X + 4)(X + 6)
(x + 5)(X + 15)
(x + 7)(x + 14)

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.