Can someone help me with number 3 please?

Which expression is equivalent to the expression shown?

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.

Yo need asap pls ! markin da brainiest too !