Plzzz help me

Simplify:
4a to the power of 2 + 3a + 5a to the power 3 - 1

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal

What is the quotient of 3x^4+22x^3+37x^2-7x+10