Use dimensional analysis:

Since we multiplied a numerator and a denominator by centimeters, we are only left with meters.
This answer is already is three significant figures by default.
Answer:H
Step-by-step explanations
Hope this helpes
Answer:
He spent 3/4 of an hour reading stories
Step-by-step explanation:
Sorry I dont have time :(
Just count the notches between the two points, there are 15 notches so 15 is tour answer