Select all expressions that are equivalent to 9(6k + 3r). A
15k + 12r

B
54k + 27r

C
6(3k + 0r)

D
3(18k + 9r)

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.