1.)

A linear regression is described by the function y = -47.21x + 29.12. What is the slope?

2).

A linear regression is described by the function y = 28.91x + 18.39. What is the y-intercept?

3.)

The function y = 0.08x + 2.56 is a linear regression of how many hours per day people between 20 and 50 years old spend driving, where y is hours per day, and x is age in years. Based on this function, how many hours per day is a 41 year old expected to spend driving?

4.)

The function y = 0.04x + 2.89 is a linear regression of how many hours per day people between 20 and 50 years old spend driving, where y is hours per day, and x is age in years. Based on this function, how much of an increase in hours of driving would someone expect after 7 years pass?

5.)

A linear regression has the following equation: y = -9x + 4.How much would y change by, if x increases by 8? Answer with a positive number if y increases, and a negative number if y decreases.