Someone please help me with this. it’s due today

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.

Is a positive integer raised to a negative power always positive

Three times the sum of a number and seven is negative thirty-six. what is the number?