book Maths Puzzle Numerical Ability

The sum of the squares of the measures of all the sides of a rectangle is 1458. Find the measure of a diagonal of the rectangle.

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book Other Question

Solve: 4x^3+8x^2-x-2=0 It rains for 40 hours, x hours at 40 ml per hour and x hours at 20 mil per hour. How long did it rain at each rate if the total rain amount is 1,100 ml?

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