The half-life of a certain substance in an aquatic environment is about 150 years. Which of the following exponential functions best models the amount A(t), in grams, of the substance that remains t years after 200 grams of the substance is applied to the aquatic environment? (The half- life is the length of time needed for an amount of the substance to decrease to one-half of that amount.) 200 A) A(C)-150()지 |2001 B) A(t) = 150|) 150t C) A(t) = 200 150 D) A(t) = 200

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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.