exam Maths Puzzle Numerical Ability

Simplify 5(sqrt3x)+ 3(sqrt3x)

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exam Other Question

A Student has scores of 73,79, and 81 on three government exams. What score does she need on a fourth exam to give her an average of 80 or better?
solve the inequality. Graph the solution
5z-12_<6z-8_< 4