I think the answer is n-20- first choice.
My work shown is how to get x. now that you have x plug it into the equation.
To test your answer add both 51 and 39, and you should get 90 (the measurement of a right angle)
The slope formula is y2-y/x2-x, so 0-5/2-3 which is -5/-1 which simplifies to 5. B is the correct answer!
Answer: 30
You want to find the lowest number and the highest number.
For stem 8, 81 is the lowest.
For stem 11, 111 is the highest.
111 - 81 = 30