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A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yarD.In terms of x, how many dollars will the carpeting cost? (1 yard = 3 feet)
E.540x

    A.20x
    B.28x
    C.60x
    D.180x
【参考答案】

A
解析:一长为18英尺,宽为10英尺的长方形地板要全部铺上每平方码x美元的地毯。以x为单位,地毯总共需花多少钱...

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