Insert three arithmetic means between 25 and 9

21, 17, 13

Step-by-step explanation:

Find the mean of the 2 given values

mean = = = 17

Noe find the mean of 25 and 17 and 17 and 9

mean = = = 21 and

mean = = = 13

Thus the 3 means are 21, 17 and 13, that is

25, 21, 17, 13, 9

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.