Answer:
A) 3, B) 3, C) 3
Explanation:
The order of magnitude is a very useful unit for when you do not have a precision in the measurement, the way to find it is to take the number to scientific notation and then change the whole part to 101 if it is greater than or equal to five or 10 or less than five
A) take my age to seconds
for example if I am 25 years old.
I take the years to seconds
age = 20 years (365 day / year) (24 h / 1 day) (3600 s / 1h)
age = 630720000 s
we carry scientific notation
age = 6.3072 10⁸ s
as the integer greater than five we change it by 10¹
age = 10⁹s
The correct answer is 3
B) The number of beats per minute approximately 80 beats in a month we have
# beats = 80 beats /min (60min / 1h) (24 h / 1 day) (30 day / 1 month)
# _beats = 3456000 beats / month
#_beats = 3,456 10⁶ beats / month
as the integer is less than five we change it by 10⁰
#_beats = 10⁶
the correct answer is 3
C) the number of heartbeats in life
suppose a life expectancy of 80 years
#_beats_total = 80 pulse /min (60min / 1h) (24 h / 1day) (365 day / year) 80 year
#_total_beats = 3 363 840 000
#_beats_total = 3.36384 10⁹
as the integer is less than five we change it by 10⁰
#_beats_total = 10⁹
the correct answer is 3
