book Maths Puzzle Numerical Ability

please give the definition of a consecutive integer

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book Other Question

I just can't figure out what they are asking .Its very hard
1.sqrt x^2 =x an identity (true for all values of x)?

2.A.
x-sqrt x=0 Solve for all values of x that satisfies the Please help me with:

Find the horizontal and vertical intercepts of the line.
-2x+y=-2

Thanks for your help