exam Maths Puzzle Numerical Ability

Have I rounded this correctly. I am supposed to round to the nearest tenth. The number is 75.982 I have 76.0. is this correct? This gets confusing for me and I thank you for your time and help.

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My question is can you help me solve this equation? This problem is a Substition.

x+2y=13
3x-5y=6

I do not understand how to find x and y for this equation. If you could help it would be great. Thank you. I've been giving the following problem:

If 2f(x)+f(1-x)=x^2 find f(x)

The answer was given as:

1/3x^2+2/3x-1/3

I need to know how this answer came about. I have two