book Maths Puzzle Numerical Ability

how do u multiply add subtract and divide fractions?

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book Other Question

i am supposed to find a value of "x", but i am not given the equation, only its derrivative. and when i integrate it, i get a value plus a constant, which i do not know. pls help Can't seem to get this one right. Any help would be appreciated.

1/x^2 + 2x + x/x^2 - 4