exam Maths Puzzle Numerical Ability

Can you please help my son with this problem it is not in a text book
1/3x=1/2

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exam Other Question

how do you write 21e ^3.4j in rectangular form, showing the steps. Find the possible values of a if the points with the given coordinates are the indicated distance apart.

29. (5,a), (6,1); d=(the square root of 10)