x=w²w-3, w being a non real cube root of x4 + 6x³ + 10x² - 12x - 19 is
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∠p and ∠r are the pairs of alternate angles formed by two parallel lines and its transversal.
If m∠ p = 800 then m∠ r = ?
a) 800 b) 1200
c) 1000 d) 900
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