1. The amount of pollution in a lake x years after the closing of a chemical plant is P(x) = 800/x tons (for x ≥ 1). Find the average amount of pollution between 1 and 10 years after the closing. (Round your answer to one decimal place)
2. Find the area bounded by the given curves. y = 6x2 - 14x - 9 and y = 3x2 + 4x - 24.
3. Find the area bounded by the given curves. y = 3x2 and y = 27.
4. Find the area bounded by the given curves. y = 4x3 + 5 and y = 4x + 5.