Final answer:
To solve for b in the equation A = (a + b + c) / 3, multiply both sides by 3 and then subtract a and c from both sides. The correct answer is A) 3A - a - c = b.
Step-by-step explanation:
To solve for b in the equation A = (a + b + c) / 3, you need to isolate the variable b.
First, multiply both sides of the equation by 3 to eliminate the denominator:
3A = a + b + c
Then, subtract a and c from both sides to get b by itself:
3A - a - c = b
So, the correct answer is:
A) 3A - a - c = b