If their is a 7% tax on a $15 toy, what is the tax amount

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

How to do this , and can some one explain

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?