D. 15
x = 8 due to the fact that the other numbers all add to 16. Then add the 8 to the 7 others that don't collect
Answer:
- x = 37
- DG = 22
- AG = 44
- AD = 66
Step-by-step explanation:
We presume your "centroid ratio theorem" tells you that AG = 2·DG, so ...
(x+7) = 2(x -15)
x + 7 = 2x - 30 . . . . eliminate parentheses
37 = x . . . . . . . . . . .add 30-x
Then AG = 37+7 = 44
and DG = 37-15 = 22.
Of course, AD = AG +GD = 44 +22 = 66
Answer:
x=3
Step-by-step explanation:
15 + 3x = 8x
- 3x -3x
15=5x
15/5=3
X=3