reference: statistics data analysis and decision modeling, 5th editions, Evans

QUESTION 5 Using Sales of the past eight quarters (from t=1 to t=8), the following trend model was generated using a simple linear regression (Sales is the dependent (y) variable and Time is the independent variable). Sales = 39 + 5 * 1 (Intercept is 39 and Slope is 5). Calculate the forecast for time period 10. (Keep two decimals)