this is a mathematic for economics question. please help me with this

6. if fixed costs are 25, variable costs per unit me 2 aral derrard function P=20-0 obtain an expression for [ ] in terms of Q and hence sketch its graph. of Find the level of output which give a profi of 31. by Fired the maximum profi and the value of Q at which it is achieved. 7. Prescoil manufactures its product at the coat of RM4 per unit and sell it for AMid par unit If he finn's fixed cod & RM12, 000 per month. The cost revenue C ard revenue function & are green by Cox)Ar + 12,000 of Determine firm's break-even point bi What is the lons sustained by the firm if only 1500 units are produced and sold arch monhit cp What is the profit if 3000 units are produced and wold each maniht 8. Solve the equitions. ir+y+3: =8 -2x + 5y+104 3.r +2y+4709