Rewrite f(x)=2(2-1)^2+3 from vertex form to standard

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? 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?