this is mathematic for economics question. please teach me how to solve this

6 . If fixed costs are 25 , variable costs per unit are 2 and demand function is P = 20 - 0 obtain an expression for*[ in terms of' @ and hence sketch its graph* a) Find the level of output which give a profit of 3 1 . 6) Find the maximum profit and the value of O at which it is achieved . 7 . Prescott manufactures it's product at the cost of RM 4 per unit and sell it for RM10 per unit . If the firm's fixed cost is RM 12 ,000 per month . The cost revenue C and revenue function Rare given by ( ( x) = 4x + 12, 000 R ( x) = 10^ $) Determine firm's break - even point* b) What is the loss sustained by the firm if only 1500 units are produced and sold each month ?" C ) What is the profit if 3000 units are produced and sold each month ? 8. Solve the equations . 4x + 1 + 32 = 8 - 2x + 58 + 2 = 4 3 * + 28 + 42 = 9