Which relation is a function?

A.

{ (8, - 1), (2, - 1), (3, 8), (2, 5}

B.

{ (7, 12), (1, - 5), (3, - 10), (2, - 5) }

C.

{ (-3, 4), (-2, 5), (0, 9), (0, 12) }

D.

{ (1, 2), (1, 5), (1, - 1), (1, 4) }

Today in today in Anchorage the expected low temperature is - 8 Fahrenheit and the expected high temperature is 12 Fahrenheit expressed it range as a compound inequality

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The equation y=3/x is an example of (direct variation, inverse variation)

If p+q+r = 1 and pq+qr+pr = - 1, and pqr = - 1, find the value of

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