exam Maths Puzzle Numerical Ability

I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power

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exam Other Question

how many grams are in 1.6 kilograms Use the ac test to determine which of the following trinomials can be factored. Find the values of m and n for each trinomial that can be factored.

x(squared) + 2x - 15

thanks