Final answer:
The element G(2,1) in the given matrix refers to the value in the second row and first column, which is 7.
Step-by-step explanation:
The matrix G given appears to be a two-dimensional matrix with the format:
3 1 4
7 1 5
In matrix notation, G(2,1) refers to the element located at the second row and first column. To answer the question,
G(2,1) = 7
Therefore, the correct answer is b. 7.