exam Maths Puzzle Numerical Ability

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

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exam Other Question

Find the equation of the line through the points (-2, 1) and (1, -4). Write the equation in standard form with only integers.

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