The cost of using a telephone in a hotel meeting room is $0.20 per minute. Which of the following
equations represents the total cost in dollars, for
h hours of phone use?

c = 0.20 (60h)

Step-by-step explanation:

The hotel charges $0.20 per minute to use the meeting‑room phone.  This per‑minute rate can be converted to the hourly rate using the conversion 1 hour =60 minutes, as shown in the following equation.

 × =

Thus, the hotel charges 0.20×60 per hour to use the meeting‑room phone.

Therefore, the cost c, in dollars, for h hours of use is c=(0.20×60)h which is equivalent to c=0.20(60h).