WORD PROBLEM someone owed money. at the end of the year she repaid the loan plus a 10.5% of the original amount for interest. she paid back a total of $828

WORD PROBLEM someone owed money. at the end of the year she repaid the loan plus a 10.5% of the original amount for interest. she paid back a total of $828

2 Questions:
1.  Find the angle between the vectors 3i + j and 2j tothe nearest 10th of a degree.
2.  Write the complex number -3-3√3i inTrigonometric form.
I can not find good examples in my test to help mealong.