The depreciating value of a semi-truck can be modeled by y = ao(0.79)x, where y is the remaining value of the semi, x is the time in years, and it depreciates at 21% per year. an exponential function comes down from the positive infinity and passes through the points zero comma seventy seven 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 depreciation rate was 15% per year? $70,000, and the graph would have a y-intercept at 59,500 $77,000, and the graph would have a y-intercept at 65,450 $77,000, and the graph would fall at a slower rate to the right $77,000, and the graph would fall at a faster rate to the right