The accompanying bar graph shows the percentage of adults in a certain city who smoked cigarettes for selected years from 1970 through 2010. 50 46 456 The mathematical model p+= 48 describes the percentage, p. of adults who smoked cigarettes x years after 1970. Use this information to answer questions (a) 3796 1 and (b) below. 2506 01970 190 to 2010 Year (a) Does the mathematical model underestimate or overestimate the percentage of adults who smoked cigarettes in 2010? By how much? Select the correct choice below and fill in the corresponding answer box to complete your choice. O A. The model overestimates the actual value by % O B. The model underestimates the actual value by %. (b) Use the model to project the year when only 18% of adults in this city will smoke cigarettes. The year predicted is 年草第 李等

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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.