book Maths Puzzle Numerical Ability

The sales price of a car is $12,590, which is 20% off the original price. What is the original price?

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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 Alicia,Terri,Maria,and Carla baby-sit for families in the neighborhood. They take care of different numbers of children:twin boys,three girls,two girls and a boy,and one girl and t