Answers:
1. X= 0
2. X= 0
3. X=3
You can use this method to solve them step by step, hope it will help!
and
both have a common denominator, so you can combine them into a single fraction:

You cannot simplify this fraction further:
- - - - - - - - - - - - - - - - - - - -
Answer:

- - - - - - - - - - - - - - - - - - - - -
I think it's d hope it helps
Answer:
Most precise to least precise
- Finding the height of the sun in the sky
- Counting heartbeats
- A calendar
- A stop watch