The depreciating value of a semi-truck can be modeled by y = ao(0.85)x, where y is the remaining value of the semi, x is the time in years, and it depreciates at 15% per year. an exponential function comes down from the positive infinity and passes through the points zero comma seventy-five thousand. the graph is approaching the x-axis. what is the value of the truck initially, ao, and how would the graph change if the initial value was only $65,000?