Mr. Kelly is retiring. He claims he can make more money by producing a high tech buzzer for students to let their teachers know they need help. He calculates that the cost to manufacture these buzzers (in $) as a function of the number of buzzers sold can be modeled by C(b) = 0.15b^2 - 12b + 350. How much cost does Mr. Kelly start with before he produces even one buzzer? How many buzzers does he need to produce if he wants to have his costs be $250? What is the minimum cost of production? How many buzzers would he need to produce to keep his costs at a minimum? I NEED THIS ANSWER WITHIN 20 minutes - PLEASE HELP!!!