book Maths Puzzle Numerical Ability

Add The square root of 54 and the square root of 24

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The instructions say divide. The problem is 4 / 7+i. I have come up with 7/12 + 1/12i. Is the the correct solution? THanks in advance. A area with two size the same length and the other two size being different. Example: Two size are 23 feet and the other two size are 21 feet and 4 feet.
What is the forumla to fi