Question

A. STEP 1B. STEP 2C. BETSIE DID NOT MAKE A MISTAKE

Answer 1

From the given problem :

$3(a+7)=-33$

Divide both sides by 3

$a+7=-11$

From here, we can say that STEP 1 is correct.

Next is to subtract 7 from both sides of the equation

$\begin{gathered} a+7-7=-11-7 \\ a=-18 \end{gathered}$

Now, we can say that Betsie made a mistake on STEP 2.

Therefore, the answer is B. STEP 2