Problems 11 - 14, given the polar coordinates, name two other equivalent representations. 11. (3," ) 12 . ( - 4 , # ) 13. (2, - " ) 14. (-1, - ") Problems 15-18, the rectangular coordinates of a point are given. Find polar coordinates for each point. 15. (V3,1) 16. (-2,2) 17. (4, -4V3) 18. (2.3, -1.5) Problems 19-22, convert the polar equation to rectangular form. Graph the equation. 19. r = 3 20. r = 4 cos 0