HELPPP PLS I DON’T UNDERSTAND

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.

Rewrite the polynomial -9x5 + 36x4 + 189x3 in factored form.

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?