Answer:
A. 2x² +12x
Step-by-step explanation:
If the mobile is balanced, the weights at each level are the same. Each of those in the lowest tier will be equivalent to 3x, for a total of ...
4×3x = 12x
Each of those in the top tier shown will be equivalent to x², for a total of ...
2×x² = 2x²
Then the sum of all parts will be ...
top tier + bottom tier = 2x² +12x
