Answer:
She is not correct because -2/5 - 1/3 actually equals to -11/15. Lisa’s mistake probably was that she subtracted 6-5 to get the 1 of 1/15.
Explanation:
This is actually really straightforward. First, you would make these fractions have the same denominator. A denominator that would be appropriate for these fractions is 15. This because you would multiply times 3 to the numerator and denominator of the first fraction and you would multiply times 5 for the to the numerator and denominator of the second fraction.
You would get:
-6/15 - 5/15
This would get you: -11/15 which is the final answer
So therefore, Lisa is not correct because (after showing work) it would actually give you -11/15
Hope this helped, Ms. Jennifer