math

The New network cell phone company charges $20 a month for service and $0.02 per minute of talking time. The mobile company charges $15 a month for service and $0.03 per minute of talking time..

(q) write expressions for the total bill of each company (1%).

2) set up an inequality that can be used to determine for what amount of time (in minutes) My mobile is the better plan. (1%).

3) solve your inequality (2%)

4) why did you have to put a restriction on the algebraic solution form part C? (1%).

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  1. cost1 = .02m + 25
    cost2 = .03m + 15

    when is cost2 < cost1 ?
    .03m + 15 < .02m + 25
    .01m < 10
    m < 1000 , so for any time less than 1000 minutes, the second plan is cheaper

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  2. 1. Y = 20 + 0.02x.
    Y = 15 + 0.03x.
    x = minutes used.

    2. 15 + 0.03x < 20 + 0.02x.

    3. 0.03x - 0.02x < 20 - 15,
    0.01x < 5,
    X < 500 minutes.

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