A. No, Alexandra made a mistake going from the given expression to Step 1. Alexandra should have added 18 and 3 before evaluating the exponent. The order of operations says to perform operations inside parentheses before you evaluate exponents.
B. No, Alexandra made a mistake going from Step 1 to Step 2. Alexandra should have divided 9 by 9 before adding. The order of operations says to divide before you add.
C. Yes, Alexandra's work is correct.
Alexandra tried to evaluate an expression. Here is her work:
(18 + 3²) / 3 = (18+ 9) / 9 step 1
= 27 / 9 step2
=3 step3
Is Alexandra's work correct?
