18. Which statement is NOTA feature of the function shown on the graph below? Monthly Charge A. As the monthly charge increases, the total monthly revenue increases quickly at first and gradually slows down. B. As the monthly charge continues to increase, the total monthly revenue reaches a maximum and then starts decreasing, slowly at first, and gradually faster. C. With monthly charges that cost a little or that cost a lot, revenue is low. D. As the monthly charge continues to increase, the total monthly revenue increases. Total Monthly Revenue

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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.