Two word problems, need full explanations

Ann is responsible for ordering a week’s supply of meat and fish for the main dishes at a local restaurant. The fish costs twice as much as the meat. She needs to order 164 meat selections and 24 fish selections. Her budget is $4240. How much can Ann spend on each type of main dish?

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You saved up $15,000 to start a new business.  This initial investment covered your rent, labor, and patents.  The supplies for each product cost you $7.00, and you are selling each product at $18. (Let x represent the number of products produced and sold.)

For this business venture:

a.  Write the cost function, C(x).

b.  Write the revenue function, R(x).

c.  Determine the break-even point. Describe what this means.

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