May you please help me with this question

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.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

The measure of an angle is 117°. what is the measure of a supplementary angle?