Use the graph to find the following. If there is more then one answer, separate them with commas
(a) All local minimum values of f:
(b) All values of which f has local minimum:

Hart manufacturing had six-month sales of $80 million, with $20 million of that amount from the internet. it set a goal to increase the percentage of total sales coming from the internet by 4 percent in the next six months. the results were total sales of $85 million. if the company meets its goal exactly, what will the dollar amount of internet sales be?