book Maths Puzzle Numerical Ability

sketch the graph of y=2sq.rt.of x. Give the domain and range.
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book Other Question

0+-2=-2
-2+-3=-5 In the exercises 23 it said to solve the given linear equation and check your answer. will I must be doing everthing wrong for I cant get the right answer.
can you help me -4(2x+1)-(x-2)=-11