Plz answer this question need ASAP

This stem-and-leaf plot represents the heights of the students on ralph's basketball team. one student's height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.

Which of the following contains a variable?

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?