20
an airplane travels at a
constant rate of 400 mph.
d= distance
t = time
which equation shows the distance traveled?
a: t = 400d
b: d = 400t
c: d = 400/t

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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:

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