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Math - Word Problem

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Word problems confuse me >_>
You are choosing between two long-distance telephone companies. Company A charges $.09 per minute plus $4 monthly fee. Company B charges $.11 per minute with no monthly fee.
X = number of minutes you call long distance
y = total cost of long distance phone service.
How am I suppose to write two equations representing the cost of each company's service for one month?

  • Math - Word Problem -

    Just take each sentence and figure out what is says algebraically.

    Company A: for x minutes, the charge is 9x + 400 cents

    Company B: for x minutes, the charge is 11x with no extra fee.

    So, which company is cheaper? That obviously will depend on the number of minutes you use.

    So, when will A charge more than B?

    9x + 400 > 11x
    400 > 2x
    200 > x

    So, if you use less than 200 minutes, A charges more.

    At 200 minutes,

    9*200 + 400 = 1800+400 = $22.00
    11*200 = $22.00

    If using more than 200 minutes, A only charges an extra 4 cents/min, while B charges 11 cents/min, so A will be cheaper.

  • Math - Word Problem -

    The cell phone bill has a base fee of $30 per month plus twenty cents per minute.

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