Answer:
65,279,520,000 i hope this helps! :)
Step-by-step explanation:
69 * 60 = 4140 number of minutes in an hour
4140 * 24 = 99,360 number of hours in a day
99,360 * 8,760 = 870,393,600 number of hours in a year
870,393,600 * 75 = 65,279,520,000 number of years
an average of 65,279,520,000 heart beats in 75 years
