{2) {5 points} A ICBUl'lbly accurate model for the price of a ernartphone running\" the log operating system is pm = 4.25:3 +107:2 321; + 690 dollars per phone: t years after 2012. According to the rnodeL when was the price per phone decreasing at its slowest rate? Hint : T his is a, question about the rate of change in price. So our function of interest is 33'\"), not pt}. After computing out if\"), you will nd that it is always negative, so a maximum of p'm will be a value at which it is still decreasing, but leastragidlz