Question No. 1) The total annual sales of a book in either paper or electronic form are 3500. Each paper copy of the book costs $30 and each e-book costs $25. The total cost is $97 500. (a) If x and y denote the number of copies in paper and electronic form, write down a pair of simultancous equations. (b) Solve the equations to find the number of e-books sold.

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.