How doi do 1 only? i honestly don't know how to do it. first one to answer is brainliest. if you mind plz also send me the answers for 1 b and c. thx

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.