exam Maths Puzzle Numerical Ability

Could someone please show me how to multiply and then simplify this expression. I have a few other problems like it and I am not sure how to solve it.
sqrt 13 * sqrt 5
I understand that by multiping 13 * 5= sqrt 65
How do I simplify this????

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exam Other Question

2/y-4^y=? if x a nail can be brought for 6p write down the cost of y nails.