(4x+3)(-2X+4) helo please

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

For how answer my question this will be the last question can you answer in math subject

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.