Answer:
option C
Step-by-step explanation:

<span>Positive acceleration occurs when an object speeds up in the positive direction.
Positive acceleration occurs when an object speeds up in the negative direction.
Hope this helps.</span>
1. D bc switch the 1/3 into 3/1, then 4 time 3/1 = 12. Basically 4 times 3 =12
2. D
Answer:
21
Step-by-step explanation:
Volume= (4/3)*pi*r^3
40007= (4/3)*pi*r^3
r=21m