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math

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i am really stuck on this application problem in my quadratic equations unit... find the width of a uniform concrete path placed around a 30m by 40m rectangular lawn if the concrete has an area that is 1/4 of the lawn.

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    Draw rectangle, label the width and length. The length is 30 and the width is 40. Divide this rectangle into fourths. Now you have four squares. Shade in one of the squares. That square will represent your concrete because its 1/4 of the lawn.
    Do you think you are able to figure out the width of the concrete now?

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