Write an expression for 5 times a number

Icould really use some with this question.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

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.