Find the sum of the first 10 natural numbers using the sum formula: S = n/2 * (a + l), where n is the number of terms, a is the first term, and l is the last term.
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What is the equation of an ellipse with major axis length of 10 and minor axis length of 8?
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What is the equation of the graph obtained by reflecting the logarithmic function y = log(x) over the y-axis?