Least common denominator of 6/7 and 5/14

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.

Which of these lines passes through the point (1,-1) and has a slope of -3?

Given that (0, 9) is on the graph of f(x), find the corresponding point for the functionf(x+4)