How to solve for functions? Kindly show the detailed solution. Thank you!

1- A manufacturer of DVD players has monthly xed costs of $9000 and variable costs of $45 per unit for one particular model. For this model DVD player, nd the function 0(1) for monthly total costs where x denotes the number of units produced and sold. 2. A small business recaps and sells tires. The business has a revenue function Rb?) = 7 1x and a cost function C(x) = 600 + 65x3 where 1 represents the number of sets of four tires recapped and sold. Find the number of sets of recaps that must be sold to break even 2. A small business recaps and sells tires. The business has a revenue function Rb.) = 7 1x and a cost function C(x) = 600 + 65x3 where 1 represents the number of sets of four tires recapped and sold. Find the number of sets of recaps that must be sold to break even 3. Find the market equilibrium point for the following demand and supply functions below, where p is price per unit and q is the number of units produced and sold. Demand: p : -2q +34\" Supply: 3.: =q +2 4. Find the market equilibrium point for the following demand and supply functions below, where p is price per unit and q is the number of units produced and sold. Demand: P = 420 7'9 Supply: p = 13gI + 80