Answer:
34
Explanation:
Happy Tuesday!
Okay to begin, you have variables and in the problem it tells you what the variables equal.
In this case, you have to plug in the values in the equation
so 5a + 3c - 7 should become
5(4) + 3(7) - 7
Then simplify
20 + 21 - 7
41 - 7
34
Hope this helped! <3