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1 (and the glyph Á) stands for a close-mid front unrounded vowel /e/. In phonetic and phonemic notation: In algebra, the letter a along with other letters at the beginning of the alphabet is used to represent known quantities, whereas the letters at the end of the alphabet (x, y, z) are used to denote unknown quantities.
2 Another is made from microorganisms carefully isolated from Petri dishes, grown into large, homogeneous populations in fermentors, and processed into combined baker's products with numerically defined ratios and known quantities of microorganisms well suited to particular bread styles.
3 One scheme to analyze the logico-mathematical properties is to classify the numerical quantities in the problem into known quantities (values given in the text), wanted quantities (values to be found) and auxiliary quantities (values found as intermediate stages of the problem).