She added, but she added to 37, so she should have subtracted 3 groups of 4 instead of adding.
Answer:
c
Step-by-step explanation:
i done it and it c
6 + 0 = 6. Which property:
This is an additive identity or identity property of addition
let the exterior angle be x
x=60°+80°(being one exterior angle is equal to two interior angle)
x°=140°
