2. Angle Addition Postulate as they are adding both angles
3. 60 + 40 = m <ABC because it's a substitution
4. 100 = m <ABC as it is simplified already
5. Definition of obtuse angle
7.8456 x 10^(-4)
this means you move the decimal place to the left 4 places to get the actual value
Answer:
Step-by-step explanation:
Y=4x-5... if you were asking for that in words
Answer:

Step-by-step explanation:
