exam Maths Puzzle Numerical Ability

unlike denominators

x over x^2+2x+1 + 1 over x^2+5x+4=

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exam Other Question

3 nth roots of 4 diveded by
5 nth roots of 8

could you tell me how to solve this problem step by step please and thankyou
Find the variation constant and an equation of variation where y varies directly as x and y=12 when x=3. The variation constant is k= ???
the equation of variation is y=???