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16 September, 23:01

Suppose you make a 4-minute local call using a calling card and are charged 7.6 cents. The cost of a local call varies directly with the length of the call. How much more will it cost to make a 30-minute local call?

-Which quantity is the dependent quantity?

-How does the word "more" affect the method needed to solve the problem?

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  1. 16 September, 23:42
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    C = kl

    The cost of a local call is the dependent variable.

    The mord more means that we are looking for the additional cost to make a 30 minutes call from a 4 minutes call, or the cost of a 26 minutes call.
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