In one year about 478 billion telephone calls were placed by 145 million united states telephone subscribers. what was the average number of calls placed per subscriber?

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7