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20 March, 01:19

To rent a certain meeting room, a college charges a reservation fee of $42 and an additional fee of $7.70 per hour. The math club wants to spend less than $80.50 on renting the meeting room.

What are the possible amounts of time for which they could rent the meeting room?

Use t for the number of hours the meeting room is rented, and solve your inequality for t.

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  1. 20 March, 04:26
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    The answer is t < 5 hours

    t - the number of hours

    An additional fee of $7.70 per hour is 7.70t

    The math club wants to spend less than $80.50: < 80.50

    Hence:

    42 + 7.70t < 80.50

    7.70t < 80.50 - 42

    7.70t < 38.5

    t < 38.5 : 7.70

    t < 5 hours
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