Please help i don’t understand this

The value √10 and √15 are plotted on the number line

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.

Graph the linear function using the slooe and y intercept