The end-of-day values of a stock market index for the week of December 9 - 13, are graphed to the right, where x is the day of the month. Q On what day did the index show the greatest rate of increase? On what day did it show the greatest rate of decrease? Give the rates. 16030- 1(9.16006) 15970- (1015948) 15910- Stock Market Index 15850 (11,15861). (13,15808) 15790- (12. 15779)3 15730 8 9 10 11 12 13 14 Day of the Month What was the greatest rate of increase? The rate was 29| points/day (Simplify your answer.) On what day did the index show the greatest rate of decrease? A. December 13 O B. December 12 O C. December 10 O D. December 11 What was the greatest rate of decrease? The rate was | points/day. (Simplify your answer.)