W is greater than or equal to 0 and less than 9

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 ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Find the missing dimension extra points

What is the product? a-3/15a × 5/a-3