Can you help me on question 14?!

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

Can someone me out here and the tell me the greatest common factor

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?