9. The letters x and y represent rectangular coordinates. Write the following equation using polar coordinates (r, ). 11. The letters r and represent polar coordinates. Write the following equation using rectangular coordinates (x, y). r=7 14. The letters r and represent polar coordinates. Write the following equation using rectangular coordinates (x, y). 15. The letters r and represent polar coordinates. Write the following equation using rectangular coordinates (x, y). r = 1 + sin 6. Find z*w. Leave your answer in simplified polar form. Express all angles in degrees rounded to the nearest tenth. 7. Find z/w. Leave your answer in simplified polar form. Express all angles in degrees rounded to the nearest tenth. 8. Find z/w. Leave your answer in simplified polar form. Express all angles in degrees rounded to the nearest tenth. 9. Find z/w. Leave your answer in simplified polar form. Express all angles in degrees rounded to the nearest tenth. 13. Write the expression in a + bi form: 14. Which of the following is a complex fourth root of -16? 15. Which of the following is a complex cube root of