The Advertising Expense and Profit of a Company in Thousands $a$

Short Answer

The advertising expense and profit of a company in thousands of dollars for each of five years is given below:
a. Solve the normal equations to find the equation of the least-squares line which will allow us to predict profit from advertising expense.
b. Check your values of $a$ and $b$ using the "solutions of normal equation."
c. If advertising expense is to be $\$ 9,000$ for a particular year, predict the profit for that year.