Acalifornia amusement park had an attendance of 14,730,000 in a year. a florida amusement park had an attendance of 17,640,000 in a year. round each number to the nearest ten million. what was the combined attendance at both amusement parks? a. 30,000,000 b. 31,000,000 c. 33,000,000 d. 40,000,000