Answer:
After 14.92 seconds, the arrow hits the ground.
Step-by-step explanation:
Given:
Initial velocity of the arrow is, 
The arrow goes up and come back to the same starting position. So, initial position is same as that of final position.
Therefore, displacement of the arrow is 0 m.
The displacement of the arrow is given as:
(equation 1)
Plug all value in equation 1 and solve for 



where 


∴ After 14.92 seconds, the arrow hits the ground.
You just subtract the number
2 / 4 x 100
= .50 x 100
= 50%
i would say B
when it says "the measure", it's refering to where the second quartile is beginning
Here are the answers for 10 and 12