Derive the least squares the estimator of Bo for model Y₁ = P + Ei regression

A study of IT companies has found the following data on the age of each company and its annual volume of sales:               Age (years)      Sales (000)             2                22             2.5             34             3                33             4                37             4.5             40             4.5             45             5                49             3                30             6                58             6.5             58     (a)   Determine the least squares regression that relates the age of company variable to the sales variable in the form y = a + bx.                                                                 (b)   Provide a practical interpretation of the coefficients a and b.   (c)   Determine the ‘goodness of fit’ (R2) of the estimated regression line.   d) Using the estimated regression line determined in (a), calculate what volume of sales would be predicted for a company that is 3.5 years of age.   (e)   If it was found that…

part c please

compute the least-squares regression line for predicting diatolic pressure (y)from systolic pressure(x) find the P-value Interpret the P-value state a conclusion