algebra

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The sides of an rectangle was 5cm by 9cm. When both dimension were increased by an equal amounts the area of the rectangle increased by 120 cm^2 find the dimensions of the new rectangle.

  • algebra -

    New rectangle has area of
    (9+x)(5+x)

    so ...

    (9+x)(5+x) - 45 = 120
    x^2 + 14x - 120 = 0
    (x + 20)(x-6) = 0
    x = -20 (silly) or x = 6

    new rectangel is 11 by 15

    check:
    new rect. = 11x15 = 165
    old rect. = 5x9 = 45

    increase = 165-45 = 120 Checks!

  • algebra -

    What is 7/12 as a percent and decimal???

  • algebra -

    Divide 7 by 12 to get the decimal.
    7/12=0.5833 (3 repeating)
    Multiply by 100 to get percent.
    58.33% (3 repeating)

  • algebra -

    Thank You Kathleen your a life saver

  • algebra -

    suppose that the height of an object shot straight up is given by
    h=544t -16t^2. h= feet and t= seconds
    Find the maximum height and the time at which the object hits the ground

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