Need help solving this math homework question

Question

The number of gallons I=F(A) needed to paint a house is a function of its surface area.

A. Explain the meaning of each function

1. 2F(A)
2. F(A+2)
3. F(A)+2

Answer 1

1. This means double F(A).

That is, it is the amount of paint needed to paint two houses of area A.

2. This is difficult to answer because the units for measuring area are not given.

If the units of area were ft² then F(A+2) is the amount of paint needed

to paint a house of area A and a piece of wood of area 2 ft².

If the units of area were m² then F(A+2) is the amount of paint needed

to paint a house of area A and a piece of wood of area 2 m².

3. This is 2 gallons of paint in addition to the amount of paint needed for a house of area A.