i) (3x¹ – 7)(–4x³ +15) ii) (2x6 — 3xp)2 iii) (4x - 3y)3

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A: Explanation of the answer is as follows

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Q: solve the following a. 20!/16! b. P{6,3} c. C{9,}

A: 6)a)

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A: the tree diagram :

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Q: 47.) Solve: |8 - m| + 4 = 21. a. 9,25 b. -25, 9 c. -25, -9 d. -9, 25

A: