exam Maths Puzzle Numerical Ability

solve for u:
mu=q

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exam Other Question

All variables are real numbers - express in simplified form

square root of 14xy^2 multiplied by the square root of 3xy^3
if john bought a calling card and used 20 min and now its worth $4.00 and then used it again and used 46 min. altogether with only $2.96 of call time left.

a. for this calling c