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Hey there! I'm happy to help!
Step 2 is incorrect. She added 4 and 2 first, but you are supposed to multiply and divide first. Then she multiplied 6 and 6, which is 36. Then she divided 36 and 2, which is 18, and then she subtracted 7, giving her 11. Step 2 is what threw the whole thing off.
Here is what Sandy should have done.
STEP 1: 6·4+2÷2-7
STEP 2: 24+1-7
STEP 3: 25-7
STEP 4: 18
I hope that this helps! Have a wonderful day! :D
Steps to solve:
6 * 4 + 2 / 2 - 7
~Multiply
24 + 2 / 2 - 7
~Divide
24 + 1 - 7
~Add
25 - 7
~Subtract
18
In step one, she added instead of multiplied which caused her to get the wrong answer.
Best of Luck!