Answer:
Se requiere un 20 por ciento de descuento.
Step-by-step explanation:
(This exercise has been presented in Spanish and for that reason explanation will be held in the same language)
Sea
el precio original del computador portatil, el nuevo precio es:


Si
, entonces el porcentaje requerido para recuperar el precio original es:




Se requiere un 20 por ciento de descuento.
350 / 28 = 12.5 gallons, so 13 gallons needed
13 X 2.5 = $32.50
No, because one x-value corresponds to two different y-values
I believe that the answer is 120 marbles.<span />