Answers: 0.08 and -0.08; 0.09i and -0.09i.
When taking square roots, we take the positive and negative answers. This gives us the first answer.
For the second answer, we rewrite -0.0081 as a complex number:
The answer is A supplementary Angle
Answer: 
Step-by-step explanation:
Given
The position of a particle is 
Velocity is given by the derivative of position with respect to time

So, velocity is constant at any point in time.
At t=8, it is 