What is the conjugate of the complex number 5i

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

If value of cos330° is √3/2 then find tan165°.

Ihonestly have no clue if it's each or none.