Question: 1. A firm produces a good which it can sell any amount of at £12 per unit. Its costs are a fixed outlay of £6,000 plus £9 in variable costs for each unit produced. Write an expression for the firm's profit in terms of the number of units produced.
2. Evaluate the expression 2x3 + 4x when x = 6.
3. Evaluate the expression (6x + 2y)y2 when x = 4.5 and y = 1.6.