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8. Consider the following graph. What is the domain of a function? 9. Consider the following graph. What is the range of a function? 10. Consider the following graph. What is the minimum and maximum x-values of a function. 11. In a coordinate plane the points (2 4) and (3 -1) are on a line. Which of the following must be true? 12. Which of the following is an equation of a line that passes through the point (0 5) and has a negative slope? 13. A plumber charges customers $48 for each hour worked plus an additional $9 for travel. If h represents the number of hours worked, which of the following expressions could be used to calculate the plumber's total charge in dollars? 14. The number of gallons of water, y , in a tank after x hours may be modelled by the linear equation y=880-50x. Which of the following statements about the tank is true? -------------------------------------------------------------------------