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Donde C(x) = Costo
0.25 = Costo por minuto
X = Numero de minutos
10 = Cargo fijo mensual.
Si C(x) = 47
Debemos despejar X de la ecuacion:
Tendriamos que:
47 = 0.25X + 10
47 - 10 = 0.25X
37 = 0.25X
X = 148 Minutos.
Comprobemos:
C(x) = 0.25X + 10
C(x) = 0.25(148) + 10
C(x) = 37 + 10
C(x) = 47 (Cumple)
Rta: Puedes hablar 148 minutos