book Maths Puzzle Numerical Ability

REVISED VERSION...left out a number...
Perform the operations and simplify.Please show in detail how it is reached?

(The line in between the fractions didnt come through...sorr

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book Other Question

y=2x^2 - 5x - 12 by graphing

y=2(125)^2 - 5(125)-12 x y=2x^2
3.13 -6.25 - 7
3.13-6.75 I was womdering if you could explain how to answer 3 problems:

1) x^2+x>0

2) x+3<-2/x

3) y=x^2+4x+1

Please explain each step so that I can use these are sample and model problems.

Thanks,

Char