Aday temperature was four degress celsius.
at night, the temperature dropped six degree.
what was the night temperature?

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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.

you,

mrb

17.08

correct me if i am wrong.