The number of gallons that needs to be pumped in is c. 15 - 15f
Since Ms. Green’s car has a 15-gallon gas tank and f represents the fraction of a tank of gasoline left in Ms. Green’s car.
Let x represent the fraction that needs to be pumped in.
Since x and f are fractions, we have that
x + f = 1
x = 1 - f
This is the fraction that needs to be pumped in.
Since the Ms. Green’s car has a 15-gallon gas tank, the number of gallons that needs to be pumped in to fill the tank is 15x = 15(1 - f) = 15 - 15f
So, the number of gallons that needs to be pumped in is c. 15 - 15f
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