C = 0.1 + 2.78e-0.39t milligrams per gallon how do you get the initial concentration? i understand you sub 0 in but i never get the same niumber that they do for the solution.

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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.