The value of a truck decreases exponentially since its purchase. The two points on the graph shows the truck's initial value and its value a decade afterward. 50 (0,40,000) 40 30 value in thousands of dollars 20 (1.24,000) 10 0.5 decades since purchase A) Express the car's value, in dollars, as a function of time d, in decades, since purchase. B) Write an expression to represent the car's value 4 years after purchase.​