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Part (A)

The blue car travel 38.5 miles on 1.25 gallons of gasoline

∴ The unit rate of the blue car = 38.5 ÷ 1.25 = 30.8  miles per gallon

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Part (B):

The red car travel miles on gallons of gasoline.

= 23.2   and   = 0.8

∴ The unit rate of the red car = 23.2 ÷ 0.8 = 29  miles per gallon

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Part (C):

Which car could travel the greater distance on 1 gallon of gasoline?

The by reviewing part (A) and part (B)

So, the blue car can travel the greater distance on 1 gallon of gasoline.

b.-4 units

all you   do is count how many times you move