exam Maths Puzzle Numerical Ability

-3 - square root of 18 / -6

sorry i do not know how to place the square root sign in so i wrote it out.

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exam Other Question

I really dont get how to do this. Here it is- Jacob has $3.50 in nickels and dimes. He has twice as many dimes as nickels. How many nickels and how many dimes does he have? Subtract write your answer in simplest form.
2y/y-4 - 3y/+3

Thank you very much.