The number of visitors P to a website in a given week over a 1-year period is given by P(t) = 123 + (t - 90) e 0.02t ", where t is the week and 1 sts 52. a) Over what interval of time during the 1-year period is the number of visitors decreasing? b) Over what interval of time during the 1-year period is the number of visitors increasing? c) Find the critical point, and interpret its meaning. . . . a) The number of visitors is decreasing over the interval (Simplify your answer. Type integers or decimals rounded to three decimal places as needed. Type your answer in interval notation.)