exam Maths Puzzle Numerical Ability

Hello, Im from norway so i dont know what type of question this is:
This should be REALLY easy but i just cant remember what to do, hehe.
What is a+5? Because if a*5=5a, can a+5 be 5a?

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exam Other Question
Add. Simplify if possible.

2 + 1
over
9t to the third power 6t to the second power __2____
√[3] + √[2]

Rationalize the demominator?