Answer:
Skate World is better because it is $1 less than Roller Central.
Explanation:
f(4) = 5(4) + 10
f(4) = 20 + 10
f(4) = 30
f(4) = 6(4) + 5
f(4) = 24 + 5
f(4) = 29
Roller Central is $30 and Skate World is $29.
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