The software rendering this question really butchered it... I think it's saying the displacement vector for the particle is

Differentiate twice with respect to time
to get the velocity and acceleration vectors, respectively:


Then at
, the acceleration of the particle is

which most closely resembles the first choice.
It's called the least squares method because the parameters of the regression line are adjusted in such a way that the sum of squares of the difference (between the actual and predicted values) is a minimum.
Answer:
answered
Step-by-step explanation:
Answer:
Step-by-step explanation:
Its A and c