exam Maths Puzzle Numerical Ability

Rationalize the denominator:
Rationalize the denominator:
5
√[3] + √[5]

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How do I solve using a system of two equations in two variables?

Four years ago, Katie was twice as old as Anne was then. In 6 years, Anne will be the same age as Katie is now. How old is each now? Perform the row operations on the given augmented matrix.
a.) R<sub>2</sub> = 3r<sub>1</sub> + r<sub>2</sub>
b.) R<sub>3</sub> = -2r<sub>1</sub> + r<sub>3</sub>
c.) R<sub>