What is the average rate of change of f(x), represented by the graph, over the interval [0,2]? a: 2 b: 1 c: 0.5 d: -0.5

Can someone me with this problem i don't understand i need

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 letters from the table represent like terms? a and b b and c a and d b and d