exam Maths Puzzle Numerical Ability

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Determine the present value of a series of 25 semi-annual payments of Rs. 10,000 each and which begins in 6 months .Assume interest at the rate of 10% per yea

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exam Other Question

Find the center of the circle with equation x^2+2x+y^2-10y+22=0. I plotted it to be (-2.4) but not sure if it is right. Thanks for checking it. Please Help! I don't not know how to solve these problems.
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