ok so i have to find how to get 5,13,3,6 to equal up to 12 u must use every number. please help asap!!! and please explain how u got your answer

15 points ! ~ see if you know the answer to both you!

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.

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers