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

Eliminate the parameter from the equations x=t+1 y=square root(4-1),,0 lessthan/= t lessthan/= 2 graph and indicate orientation.

Thank you for all your assistance,,,this means i just dont understand how to do this problem please break dont to step by step?