Answer:
90/200
Step-by-step:
Kahn Academy marked it correct
Just take both sides multiply by 2 then divide 3
Given :
A particle moves in the xy plane starting from time = 0 second and position (1m, 2m) with a velocity of v=2i-4tj .
To Find :
A. The vector position of the particle at any time t .
B. The acceleration of the particle at any time t .
Solution :
A )
Position of vector v is given by :

B )
Acceleration a is given by :

Hence , this is the required solution .
Honestly idk you’ll need a better way to explain this
Associative Property of Addition hope this helps