Sociologists have found that information spreads among a population at an exponential rate. suppose that the function y=525 (1 - e^-0.038t) models the number of people in a town of 525 people who have heard news within t hours of its distribution. use your graphing calculator to graph the function y=525 (1 - e^-0.038t) and determine when 90% of the people will have heard about the grocery store opening. a. 32 h b. 61 h c. 54 h d. 76 h