exam Maths Puzzle Numerical Ability

4) Perform the operation: (5x2 - 3x - 9) + (2x2 - 7x + 4)

5) Multiply: [(1/4)z + (1/3)][(1/4)z - (1/5)]

6)Simplify and evaluate:
(22x5y-3z4/40x-2y-8z5)3

thank you very much

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True or flase: For a triangle with sides having lengths r, s, and t, if r2 = s2 + t2 then the triangle must be a right triangle. A student makes a $9.25 purchase at a bookstore with a $20 bill. The store has no bills and only quarters and fifty cent pieces for change. There are 30 coins total given back to t