book Maths Puzzle Numerical Ability

I cannot figure out the solution to what number makes the absolute value of x equal to the negative absolute value of x?
Please help.

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book Other Question

THE GRAZING GOAT

Zoe the goat is tied by a rope to one corner of a 15 meter by 25 meter barn in the middle of a large, grassy field. Over what area of the field can Zoe graze if I can't seem to get the answer to this problem.

r=-0.08p^2+300p

Factor out the price on the right hand side of the formula