Respuesta :
(4h+3f+6). 4h represents the 4 hamburgers, 3d represents the 3 fries, and the 6 is the 2 milkshakes at 3 dollars each.
It should be (4h + 3f + 6) because that is the total of the hamburgers, fries, and shakes. The $20 is the bill they gave and when you subtract (4h +3f + 6) the result is the change the get back.