The cost of having photos taken includes a sitting fee and $12 for each portrait. The cost of 3, 6, and 9 photos respectively is $51, $87, and $123. What is the sitting fee? Use units in your answer and round answer to the hundredths place, for example $2.35
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3 photos:
12x3= 36
51-36= 15

6 photos:
12x6= 72
87-72=15

9 photos:
12x9=108
123-108= 15

Each portrait is 12 dollars. After finding out the total of the portraits themself. The remainder of portraits subtracted from the total will be 15. Therefore the sitting fee is 15 dollars.

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The cost of having photos taken includes a sitting fee and $12 for each portrait. The cost of 3, 6, and 9 photos respectively is $51, $87, and $123. What is the sitting fee? Use units in your answer and round answer to the hundredths place, for example $2.35 DUE TMR

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The cost of having photos taken includes a sitting fee and $12 for each portrait. The cost of 3, 6, and 9 photos respectively is $51, $87, and $123. What is the sitting fee? Use units in your answer and round answer to the hundredths place, for example $2.35
DUE TMR