exam Maths Puzzle Numerical Ability

3/x +5/x2
_________
9/x2-25/x Trying to solve and complex fraction

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Can someone please show me how to do these??

Find theta to four significant digits for 0 < or = to ( less than or equal to) theta < 2pi for:

a) cos theta = -0.9135
b) sin th
Can you please help me understand the rules and format for this type of math?


(6x^2-4x+7)+(2x^2-3x-9)=

I tried this one,but i cant figured it out?

6x-(4x-5)=13
6x+(4x+5)=13