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Math Help - Algebra

  1. #1
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    Unhappy Algebra

    I really need your help as i am struggling in solving these questions

    a) The rental charge for davids telephone is 25 per quarter and calls cost 5p per unit. He wishes to keep the bill to a maximum of 60. Let x be the number of units used and form an inequality in x and solve it.

    b) Carmel borrows a car from khalid. He says that she can borrow it for 5 hours but must not exceed 50mph
    Let m be the number of miles driven and form an inequality for m and solve it.

    Your help would be most appreciated
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by nbukhari View Post
    I really need your help as i am struggling in solving these questions

    a) The rental charge for davids telephone is 25 per quarter and calls cost 5p per unit. He wishes to keep the bill to a maximum of 60. Let x be the number of units used and form an inequality in x and solve it.
    The maximum available for calls is 60-25=35 pounds = 3500 p. The cost of x calls is 5x p, so:

    5x <= 3500,

    or:

    x <= 700.

    RonL
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by nbukhari View Post
    b) Carmel borrows a car from khalid. He says that she can borrow it for 5 hours but must not exceed 50mph
    Let m be the number of miles driven and form an inequality for m and solve it.
    m/5 <= 50

    (miles travelled divided by time is the average speed, which must be less than the maximum speed)

    So:

    m <= 250 miles

    RonL
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