Answer:
21
Step-by-step explanation:
21-12=9
This question is easier than it seems. If there are 9 consecutive integers with the mean being 16, then 16 must be the median. So just add four on top and four below 16 to give you your range of 9 values, 12-20. 12+13+14+15+16+17+18+19+20=144, 144/9=16. So the mean of the first four numbers is (12+13+14+15)/4= 13.5. If you check, 13.5 is also the median of these four numbers.
5. Slope = 3, Y-Intercept=4
6. Slope = -2, Y-Intercept=8
If your just looking for x then x=2
