exam Maths Puzzle Numerical Ability

Find the area of an equilateral triangle with a apothem 3.5 meters long and each side 12 meters long

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Please can someone help me. I am having trouble with this problem on a homework sheet.

3.) Write the series in summation notation. Use the index i and let i begin at 1 in each Solve the equation: x-3-sqrt of x-1=0
The answer is one of the following: A.x=1,7 B.x=2,5 C.x=5 D.x=7

Thank you for your time!