Final answer:
The value of A + B + C * 4 is -3A + 15.the value of A + B + C * 4 is -3A + 15.
Step-by-step explanation:
In this problem, we are given the equations: A + A = 2, A + B = 3, and A + B + C = 6. We need to find the value of A + B + C * 4. To find the value, we can substitute the given values of A and B into the last equation to get A + 3 + C = 6. Now, let's solve for C. C = 6 - A - 3 = 3 - A. Substituting this value back into the equation A + B + C * 4, we get A + 3 + (3 - A) * 4. Simplifying further, A + 3 + 12 - 4A = -3A + 15. So, the value of A + B + C * 4 is -3A + 15.