Just need a lil help with this

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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.

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !