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11 September, 09:24

The cost for a long-distance telephone call is $0.35 for the first minute and $0.10 for each additional minute or a portion thereof. The total cost of the call cannot exceed $3. Write an inequality representing the number of minutes m, a person could talk without exceeding $3.

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  1. 11 September, 12:16
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    0.25 + 0.1 t < 3

    Step-by-step explanation:

    Let the total time for which call is made is t minutes.

    of those t minutes, first minute costs $0.35.

    Excluding 1 minute, no. of minutes left = (t-1) minutes

    it is given that after first minute each additional minute cost $0.10.

    Thus, cost of (t-1) minutes call = (t-1) * $0.10.

    Total cost = first minute call cost + cost of (t-1) minutes call

    = 0.35 + (t-1) * 0.10

    = 0.35 + 0.1t - 0.10

    = 0.25 + 0.1 t

    Thus, total cost is 0.25 + 0.1 t.

    it is given that total cost cannot exceed $3

    Thus, 0.25 + 0.1 t cannot exceed $3

    which is same 0.25 + 0.1 t is less than $3

    in inequality term it can be written as

    0.25 + 0.1 t < $3

    Thus, inequality as required is 0.25 + 0.1 t < 3
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