What is a spending variance and what does it mean? Let r be the remainder of the division b ÷ a. Assume that c | a and c | b. Prove that c | r. Find the angle ∠BAC if A = (−2, 1, 3), B = (0, 1, −1) and C = (1, 0, 2). Find the next number in the sequence 3, 7, 15, 31, 63.
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