21 or two-one also known as the number after 22 and the number before 23. Hope this helped. ;)
Answer:
The groups walking speed is
or 
Step-by-step explanation:
we know that
To find the speed divide the distance by the time
so

Convert to mixed number

Answer:
that would be 234552 square units
Step-by-step explanation:
Answer:
1
Step-by-step explanation:
to get at least 50% you would have to add 1 more marble