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The unit price (rate) per 1 gallon of gas is $3.00. The constant of proportionality is $3.00. Using the unit rate, how much will 15 gallons of gas cost? a) $3.00 b) $21.00 c) $45.00 d) $90.00
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The unit price (rate) per 1 gallon of gas is $3.00. The constant of proportionality is $3.00. Using the unit rate, how much will 15 gallons of gas cost?

a) $3.00
b) $21.00
c) $45.00
d) $90.00

User Ruvo
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1 Answer

7 votes
Hi I’m pretty sure the answer is c.

Since 1 gallon is $3 you know that if you multiply 1 by 15 and ALSO multiply $3 by 15 you will have your answer.

15x1 gallon = 15 gallons
15x$3 = $45

15 gallons = $45
User Lomine
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