In △ABC, X is the midpoint of AB¯¯¯¯¯¯¯¯, Y is the midpoint of BC¯¯¯¯¯¯¯¯, and Z is the midpoint of AC¯¯¯¯¯¯¯¯. If AB = 12 cm, XZ = 5 cm, and XY = 2 cm, what is the perimeter of △ABC?

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answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

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