6. a college bookstore sells a textbook that costs $75 for $110 and a textbook that costs $80 for $120. If the markup policy of the bookstore is linear, write a linear function that relates the sales price S and the cost C. what is the cost of a book that sells for $200?
25. The boiling point of a substance is 230 degrees on the Fahrenheit scale and 120 degrees on the celsius scale. The freezing point is -140 degrees F and -95 degrees C.
A. express the degrees celsius C as a function of degrees Fahrenheit .
B. express the degrees Fahrenheit as a function of degrees celsius. Is this the inverse of the function that you found above?
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