exam Maths Puzzle Numerical Ability

What is the answer to radical over 18 - radical over 8=

Thanks for all your help.

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exam Other Question

The sum of two numbers is 18. If the sum of their squares is a minimum find the numbers. n q
2 11
4 17
5 23
8 29
10 35
Whats is the rule of this algebraic expression?

Which one of these senetences best describes this rule.
Q=(3+N)*5 Q=3*(N+5) Q=3N+5