Vertex=(0,0) directrix is x=2.5 or x-2.5=0 so focus S is (-2.5,0) let P(x,y)be any point on the parabola. Let M be the foot of perpendicular from P(x,y) on the directrix. then SP=PM
22.75 - 3.25 = 19.5 He earned 19.5$ by selling both water and lemonade. Lemonade cost 3$ each so 3x3=9. Water cost 1.5$ each so 1.5x7=10.5. 10.5+9=19.5.