Hints on some homework questions:

__ Section 1.4 # 71: __

(a). Use

(b). Set the equation above equal to 500 and solve for t.

__Section 1.6 # 58__

Total cost of car A after t years is : 10,000 + 550t + 625t=10000 + 1175t

Total cost of car B after t years is: 12,000 + 600t + 375t=12000 + 975t.