Marissa simplified the expression shown
below as follows.
10 - 25 - 6+(-2)
step 1
the number syster
-15 - 6+(-2)
-9+(-2)
-11
step 2
step 3
which of the following best describes
marissa's mistake?
a. in step 1, she should have replaced
10 – 25 with 15, not -15.
b. in step 1, she should have replaced
10 – 25 with –35, not -15.
c. in step 2, she should have replaced
-15 - 6 with +21, not -9.
d. in step 3, she should have replaced
-9 +(-2) with – 7 not -11.