exam Maths Puzzle Numerical Ability

Find the principal root

square root of m square( m square is under the radical)

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exam Other Question

if steven can make 20 drinks in 5 minutes, sue can make 20 drinks in 10 minutes and jack can make 20 in 15 minutes. How much time will it take all three of them working together to make 20 drinks Please Help!!!!
the directions are to find the x-intercept and y-intercept of each equation. then graph the equation.

y=4x-2

please help me....