At a car race, Billy's favorite car completed 5 laps in 12 minutes. What was the car's rate in minutes per lap?

all it means is function 3

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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: