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

A roof rises 7.5 ft over a horizontal distance of 12.27 ft. What is the slope of the roof to the nearest hundredth? A hose can fill a swimming pool in 6 hours. Another hose needs 3 more hours to fill the pool than the two hoses combined. How long would it take the second hose to fill the pool?