It costs Apple $1900 to manufacture 10 iPhones per hour and $3780 to manufacture 20 iPhones per hour at a particular plant. Use this information to find a linear function that give the cost, C, as a function of the number, x, of iPhones manufactured per hour.
a. C = 188x + 20
b. C = –188x + 100
c. C = 1880x + 1900
d. C = 188x + 1900
e. C = 1880x + 10
What are the units of the slope of the linear function?
a. iPhones (per hour)
b. Dollars
c. iPhones (per hour) / dollar
d. dollars / iPhones (per hour)