math

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the dimensions of a door are 3ft by 7ft 6in. if the same amount is added to each dimension of the door, the area is increased by 18ft^2. Find the dimensions of the new door. answer is supposed to be 4.5ft by 9ft need help asap

  • math -

    (3+x)*(7.5+x) - (3*7.5) = 18

    Solve for x and then add to the original dimensions.

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