If p (x) = x2 - 1 and q (x) = 5 (x minus 1), which expression is equivalent to (p - q) (x) ?

5 (x - 1) - x2 - 1

(5x - 1) - (x2 - 1)

(x2 - 1) - 5 (x - 1)

(x2 - 1) - 5x - 1

Cara computes the mean and variance for the set 87, 46, 90, 78, and 89. She finds the mean to be 78. Her steps for finding the variance are shown below.

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F K = (x, y), is Set K a function?

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