Answer:
We have that:

And we want to find the value of g(4)
Then we are evaluating the function g(x) in x = 4, this means that we need to locate all the "x" in g(x), and replace them by 4.
If we do that, we get:

Now we can just solve this to get:

Answer:
4.5
Step-by-step explanation:
15% of 30 is 4.5
the answer to the first part is 2x-3