Need help understanding these practice questions. My professor had a horrible way of explaining them. Thank you

A computer firm is planning to sell a new graphing calculator. For the first year, the fixed costs for setting up the new production line are $124,000. The variable costs for producing each calculator are estimated at $16. The sales department decides that the calculators can be sold during the first year at a price of $47 each. a) Find C(x), the total cost of producing x calculators. b) Find R(x), the total revenue from the sale of x calculators. c) How many calculators must the firm sell in order to break even? ..... a) Find C(x) in dollars. C(x) =A farmer buys a new tractor for $158,000 and assumes that it will have a trade-in value of $89,000 after 10 years. The farmer uses a constant rate of depreciation to determine the annual value of the tractor. (A) Find a linear model for the depreciated value V of the tractor t years after it was purchased. V=Use the formula C= -(F - 32) for conversion between Fahrenheit and Celsius to convert each temperature. a. 77'F to Celsius b. - 20'F to Celsius c. 50 C to Fahrenheit a. 77'F = C (Type an integer or decimal rounded to the nearest tenth as needed.)