Good Morning(unless it's night)

Lines p and q intersect. find the value of b. show your work. cite any theorems you use.

Me because some of question i don’t understand

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.