Answer:
b. 10 - 61
Explanation:
10 + 61 is 71
We need to change the addition sign to subtraction.
10 - 61= -51
We need to find an equation that is equal to -51.
a. -10 +61
That equals 51, which is not 71, which means it is not letter a.
b. 10 - 61
That equals -51, which is not 71, which means it is not letter b.
c. -10 - 61
That equals -71, which is not 71, which means it is not letter c.
d. 6- 107
That equals -101, which is not 71, which means it is not letter d.