Question 67485
We are given g(x)=3x-4.  To solve g(2a+1) all we need to do is to plug 2a+1 into the original equation for x and simplify!

g(2a+1) = 3(2a+1)-4  ------> Multiply the 3 into 2a+1

 = [3(2a) + 3(1)] - 4
 = 6a + 3 - 4
 = 6a - 1. 

Hope this helps!!