book Maths Puzzle Numerical Ability

Convert the measure, round your number to the nearest tenth.

65 lb/ft cubed to kg/L (1 kg is about 2.205 lb; 1ft cubed is about 28.3L)
I cannot understand how to preform this

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book Other Question

square root of 18x^3 * square root of 2x^2y^3 A quadratic equation always has two solutions. How do you account for
this difference when compared to linear equations? At what step in the
process do we ensure that we get two solutions when using the
Completing the Square method?