Miss Pacheco, Mr. Edwards and Mr. Richards are three math teachers at a Turner middle school. Miss Pacheco is three years older than Mr. Richards. Mr. Edwards is twice as old as Mr. Richards. The sum of Mr. Richards age and mr. Edwards age is 81. How old is each person ?

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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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step-by-step explanation: