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Determine whether the lines l1 and l2 are parallel, skew, or intersecting. L1: x = 9 + 6t, y = 12 − 3t, z = 3 + 9t l2: x = 4 + 16s, y = 12 − 8s, z = 16 + 20s
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Determine whether the lines l1 and l2 are parallel, skew, or intersecting. L1: x = 9 + 6t, y = 12 − 3t, z = 3 + 9t l2: x = 4 + 16s, y = 12 − 8s, z = 16 + 20s

User SargeATM
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Over which interval(s) is the function decreasing?

User Verthosa
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