a = 3b – c Find the value of a when b = 11 and c = 4. Sofia thinks that the answer is 30.

To find the value of 'a', we need to substitute the values of 'b' and 'c' into the equation.

The equation is a = 3b - c.

Step 1: Substitute b = 11 into the equation. This gives us a = 3*11 - c.

Step 2: Substitute c = 4 into the equation. This gives us a = 33 - 4.

Step 3: Simplify the equation to find the value of 'a'. This gives us a = 29.

So, Sofia's answer of 30 is incorrect. The correct answer is 29.