Final answer:
To find GMa, we need to average the values of AG and AMa. The equation for GMa is GMa = (AG + AMa) / 2.
Step-by-step explanation:
Solution:
Given:
AG = 5x + 12
AMa = 10x - 18
To find GMa, we need to find the average of AG and AMa.
GMa = (AG + AMa) / 2
Substituting the given values, we get:
GMa = (5x + 12 + 10x - 18) / 2
GMa = (15x - 6) / 2
GMa = 7.5x - 3
Therefore, GMa = 7.5x - 3