The ice skating rink charges an hourly fee for skating and 3 dollars to rent skates for the day. Gillian rented skates and skated for 3 hours and was charged 21 dollars Which equation represents the cost, c of x , of ice skating as a function of x , the number of hours of skating?
Answer
A
c of x is equal to 8x plus 3
B
c of x is equal to 7x plus 3
C
c of x is equal to 6 x plus 3
D
c of x is equal to 3 x plus 3
Explanation
The $21 charge includes $3 for skate rental, so the skating fee for 3 hours was $21 − $3 = $18. The hourly skating fee is $18 ÷ 3 = $6, and adding the $3 rental fee gives c(x) = 6x + 3, choice C.
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