exam Maths Puzzle Numerical Ability

Would someone check this for me and see if it is correct? I do apreciate it and thank you so much.

Add -3/5 + (8/35)

My answer is -13/35

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exam Other Question

Find all positive values for k for which each of the following can be factored.

x^2 + x - k

I am having trouble with this problem and need some help. Thanks. Let f(x)= x + 4 and g(x) = x2 + 5. Write and expression for each function. State any restrictions.
This is what I tried.
x+4 -x2 + 5 = -x2 + x + 9 (is that right?)