math (area&perimeter)

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the demensions of a rectangle are 5y for the height, and 7y-4 for the length. the question i need help with is asking me to simplify the equation for the perimeter and the area of this figure.

  • math (area&perimeter) -

    P = 2*5Y + 2(7Y - 4),
    P = 10Y + 14Y - 8,
    P = 24Y - 8,
    P = 8(3Y - 1).

    A = 5Y(7Y - 4),
    A = 35Y^2 - 20Y,
    A = 5Y(7Y - 4).

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