The percentage of the work force having manufacturing jobs was 10.1% in 2010 and decreased by about

Question:

The percentage of the work force having manufacturing jobs was 10.1% in 2010 and decreased by about 0.43 percentage point per year until 2014. Let p = f (t) be the percentage of the workforce who have manufacturing jobs at t years since 2010.
a. Find an equation of f. b. Find f(4). What does it mean in this situation?
c. Find the slope. What does it mean in this situation?
d. Find the p-intercept. What does it mean in this situation?