The average score on the mathematics portion of the SAT has been increasing over the past 10 years. In 2009 the average SAT mathematics score was 474, while in 2019 the average SAT mathematics score was 492. Assuming the rate of increase is constant: (a) Find a linear equation that relates the average SAT mathematics score S to the time t, where t is the year. (b)Find the slope of the linear equation and interpret it. (c) If the trend continues, what will the average SAT mathematics score be in 2022? (d)What year will the average SAT mathematics score be 519?

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