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apalacios3503
16.09.2019 •
Mathematics
Why must a measurement include a number and a unit
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Ответ:
Hey ! A measurement must include both a number and a unit because a number is meaningless without a unit; a unit describes what the number is measuring.The number specifies the finite value and the unit specifies the increment and describes what is being measured (length, weight, force, etc)..
hope this helps
Ответ:
The next time they will all flash together at 8:03 AM.
Step-by-step explanation:
Given : A light flashes every 3 minutes, a second light every 90 seconds, and a third light every 45 seconds. If the three lights flash together at 8:00 AM Monday morning.
To find : When is the next time they will all flash together?
Solution :
First flashes in 3 minutes.
In seconds, 1 minute = 60 second
3 minute = 180 second
Second in 90 seconds.
Third is 45 second.
To get that light flash together we find the LCM of 45,90 and 180.
2 | 45 90 180
2 | 45 45 90
3 | 45 45 45
3 | 15 15 15
5 | 5 5 5
| 1 1 1
Three lights flash together at 180 second.
Convert into minutes,
1 second =
minutes
180 second =
minutes
180 second = 3 minutes
The three lights flash together after 3 minutes.
Therefore, the next time they will all flash together at 8:03 AM.