Student enrollment at a university over the past six years is given below. Year (t) Enrollment (In 1,0005) 1 6.73 2 18-3 3 8.23 4 8.13 5 8.93 6 8.13 (a) Develop a quadra ic trend expression for the above time series. [Round your numerical values to three decimal places.) Tr = 6.94? + 2er (b) Using the quadratic trend expression developed previously, forecast enrollment for year 7. Give your answer in number of enrollments. (Round your answer to the nearest integer.) Cir