Please help and show work ​

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

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.