book Maths Puzzle Numerical Ability

If possible, simplify the ratinoal expression.

x + 3 / x^2 + 6x + 9

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book Other Question

I have been working on this problem for a week and I still can't figure it out. This is what I have so what am I doing wrong?

Let the function f be defined by f(x) = 1/(sqrt1-x Jamie gave Laura $3 more than Laura already had. Now Laura has $19. How much did jamie gave her?