exam Maths Puzzle Numerical Ability

what is the solution to 5w^5/7=160?

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exam Other Question

a poster is 25 cm taller than it is wide. it is mounted on a piece of cardboard so that there is a 5 cm border on all sides. if the area of the border alone is 1350 cm^2, what are the dimensions of the poster? please help solve this equation: cos 2x- sin squared x/2 +3/4=0 from 0 to 360 degress.