Find the unknown measures. Round lengths to the nearest hundredth and angle measures to the nearest degree. PLEASE HELP

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.

Use the distributive law to multiply. 3(4x + 5y + 6)

Is this a polynomial function? i need to know asap