Does anyone understand this? will give for correct answer

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.

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

What is the result of adding the system of equations? 2x+y=4 3x-y=6