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21 June, 19:59

Raj is deciding between two cell phone plans, A and B, which are both linear functions. The monthly charge for plan A according to the number of minutes used is shown in the table. Monthly Charge for Plan A Minutes used, x Monthly charge ($), y 0 14.45 3 14.84 6 15.23 9 15.62 12 16.01 Plan B has the same monthly base charge as plan A, but it charges a different amount per minute used. If the total monthly charge for plan B is $22.10 when 45 minutes are used, what is the slope of the linear function that represents the cost of plan B? 0.13 0.17 0.39 0.45

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  1. 21 June, 20:39
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    Let m be the required slope

    22.1 = m (45) + 14.45

    45m = 7.65

    m=0.17

    Hence the slope is 0.17
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