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Answer:
Step-by-step explanation:
Let x be the hours Mary rented the bike. Her total cost would be the sum of the $16 up-front service charge plus x (hours) times $6/hour, to account for the rental time. We can write that as:
$16 +( $6/hr.)x = $66
16 + 6x = 66
6x = 50
x = (50/6) hours
x = (25/3) hours
x = 8 1/3 hours