A corporation owns several companies. The strategic planner for the corporation believes dollars spent on advertising can to some extent be a predictor of total sales dollars. As an aid in long-term planning, she gathers the following sales and advertising information from several of the companies for 2019 ($ millions). E Advertising 12.5 3.7 21.6 60.0 37.6 6.1 16.8 41.2 Sales 148 55 338 994 541 89 126 379 Develop the equation of the simple regression line to predict sales from advertising expenditures using these data. Do not round the intermediate values. (Round your answers to 3 decimal places.) + X

What is the total effect on the economy of a government tax rebate of $500 to each household in order to stimulate the economy if each household will spend of the rebate in goods and services?

Find the mean hourly cost when the cell phone described above is used for 240 minutes.