Assignment:
A manufacturer buys $20,000 worth of machinery that depreciates linearly so that its trade-in value after 10 years will be $1,000.
a) Express the value of the machinery as a function of its age and draw the graph.
b) Compute the value of the machinery after 4 years.
c) When does the machinery become worthless?
Provide complete and step by step solution for the question and show calculations and use formulas.