2(11/2x8 1/2)+2(5 1/2x12 3/4)+(8 1/2+12 3/4

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

If f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

Precalculus question, image attached.