What is 12x²y - 8x²y² + 11x²y - 4x³y² - 9xy² simplified?

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

Do you mind if you guys me with this question i’m on number 8

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents