exam Maths Puzzle Numerical Ability

sqrt (-36) simplify please help me learn this and show all work.

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exam Other Question

#1 Here is the question from the book:
Draw the graph y=x� for -4 < x <4, taking 1cm to represent 1 unit on each axis. Use your graph to find: (a) square root of 6.2 (b) (-3.6) Please describe the graph of f(x)=4.

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