Use the graph on the right to answer the following questions. a. Estimate the pressure at altitudes of 9,000 feet, 18,000 feet, and 21,000 feet. b. Estimate the altitudes at which the pressure is 24, 17, and 13 inches of mercury. c. Estimating beyond the boundaries of the graph, at what altitude do you think the atmospheric pressure reaches 5 inches mercury? Is there an altitude at which the pressure is exactly zero? Explain your reasoning.

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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.