exam Maths Puzzle Numerical Ability

subtract the sum of 7x^2-4x and -3x^2+4x from 2x^2+5x

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MAY ANYONE PLEASE HELP ME HERE
(a)use the truth tables to verify that p⇒q≡�p∨q and that p⇔q≡(�p∨q)∧
(�q∨p.
(b)use the logical equ determine the total surface area of a cylinder whos length is 16 cm and a height if12 cm