Find the required linear model using least-squares regression. The accompanying table shows the approximate amount (in billions of dollars) of student loans in repayment in various quarters of 2015 and 2016. Let x = 1 corres Quarter Loans in Repayment 515 2 545 3 570 4 580 (a) The linear model for the data is y=x+ . (Round to the nearest tenth as needed.) 5 6 615 640 (a) Find a linear model for these data. (b) Assuming the trend continues, estimate the amount of loans in repayment in quarter 8. 7 660 (b) The amount of loans in repayment in quarter 8 is approximately $ billion. (Round to the nearest integer as needed.) C

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