The percentage y of consulted books in a library specialized in literature about areonautics is modelled by the formula y = 100-Ae¯at Given that 1% of the books were consulted at the opening of the library, and 50% after 1 year, (a) find the value of A and a, correct to 3 decimal places, (b) predict the percentage of consulted books after 5 years, (c) predict the percentage of consulted books in the long run.

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.