What is the answer for 10 and 11 step by step. Please

Me answer number 3plz explain how you do it

The graph shows the rate at which paint is used to paint a wall.enter values to complete each statement below based on the graph.when 1 gallon of paint has been used, ( # ) square feet of the wall will be painted.the unit rate is ( # )square feet per gallon.

What is the value of f(x) = 2.2 for f(-2)?