exam Maths Puzzle Numerical Ability

Please help. Thank you.

Find -x when x=20

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exam Other Question

simplify. assume all variables represent positive numbers

sqrt(x^4y^3) Please someone help!
(a) Find sin 26.1 degrees
(b) Find the acute angle, 0(with a dash through it),to the nearest tenth of a degree is cos 0 (with a dash through it) = 0.8084