Answer:
70°
Step-by-step explanation:
55 plus 55 = 110
180 - 110 = 70
You can think in reverse. Addition is the opposite of subtraction. So to solve 15-8, you can ask "8 plus what number is equal to 15?" and note how 8+7 = 15. So that's why 15-8 = 7. Similarly, 15-7 = 8 can be solved the same way.
It's the second option
Graph for -(x+3)(x+1)
