Final answer:
For the function G(x) = 5x + 3, to find G(2b) we substitute 'x' with '2b' and calculate the result to be 10b + 3, corresponding to option (a).
Step-by-step explanation:
To find G(2b) for the function G defined by G(x) = 5x + 3, we replace 'x' with '2b' in the function's expression:
G(2b) = 5(2b) + 3
Now we perform the multiplication:
G(2b) = 10b + 3
Therefore, the answer to what is G(2b) is 10b + 3, which corresponds to option (a).