exam Maths Puzzle Numerical Ability

Please help me simplify this expression:

the square root of x^2

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exam Other Question

Find the maximum value of y=-x^2+6x. I worked it out to be 10 but not to sure about that. thanks for any help given. Find the equation, in slope-intercept form, of the line that passes through the

points (5,6) and (-7,3)