What is the unit rate for $1.99 per pound

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

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.