All the triangles are isosceles meaning that they have to sides that are equal
1. -5^3-4^3
2. -15-64
3. -79
When you subtract a negative, it changes it to adding a positive.
= -2.5 - (-3.25)
= -2.5 + 3.25
= 0.75
Hope This Helped! Good Luck!
Answer:
Step-by-step explanation:

just a plain vanilla substitution