exam Maths Puzzle Numerical Ability

3/2y - 3/2y+4

4/3n + 2/n+1 + 2 n^2+n

please help i do not know how to figure these out

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exam Other Question

Find the value of c that makes x^2+5x+c a perfect square trinomial.

Thanks for the help What is the slope and y- intercept

x = -9