exam Maths Puzzle Numerical Ability

Rationalize the denominator. Assume that all expressions under radicals represent positive numbers:
(sqrt(r) - sqrt(s))/(sqrt(r)+sqrt(s))

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exam Other Question
Find the slope-intercept form of the line that contains the following points: (-6, -6) and (-3, 1). Write an equation for the line contaning the indicated points.
(-4,-4) and (-3,-3)