Task 7: Assume a linear trend for the last two years in the data set. Find a linear model. ( 5 points) Use (54,17824) and ( 55, 18151) D = at + b a=( - )/( - ) a= D = ?t + b 2 Using (54, 17824) to find b 17824 = ?m + b ? =?+b ?=b D = ?m + ? Task 8: Use your model to predict the national debt for the year 2020. ( 2 points) D = ?m + ? D = ? ( 60 ) +? (billions) According to this model, the Price is expected to be $ in the year 2020