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Answer:
a) see attachment
b) negative values for miles or gallons are not possible
c) 45 miles
Step-by-step explanation:
See the attachment for a graph
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Graphing in the first quadrant is all that is necessary, because the number of gallons and the number of miles cannot be negative.
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Use 2.5 for g and evaluate:
d = 18(2.5) = 45
Rick can drive 45 miles on 2.5 gallons of gas.