The amount of music (in billions of hours) listened to on an on-line streaming site can be approximated by the function f(x) = 0.56 e -18x, where x = 1 corresponds to the first quarter of the year 2011, x = 2 corresponds to the second quarter of the year 2011, etc. Find the hours listened for the following quarters. (a) Second quarter of 2011 (b) First quarter of 2012 (c) When did the hours exceed 3.3 billions of hours? (a) Find the hours listened for the second quarter of 2011. billions of hours were listened for the second quarter of 2011. (Round to one decimal place as needed.) (b) Find the hours listened for the first quarter of 2012. billions of hours were listened for the first quarter of 2012. (Round to one decimal place as needed.) (c) When did the hours exceed 3.3 billions of hours? The hours listened exceeded 3.3 billion in the quarter of (Round down to the nearest quarter.)