On the unit circle, what is angle measurement in radians for the coordinate (-1/2,√3/2)?

(Can u also solve the rest too plz )

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

What is the quadric regression equation that fits these data

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?