Use absolute value. If both signs are negative you will get a negative number. if both are positive you get positive. if the signs are different, subtract the smaller absolute value from the larger absolute value.
Answer:

Step-by-step explanation:
Simplify the equation 

Since

and

we have

Answer:
m∠1 = 100°
Step-by-step explanation:
I think it would be a no slope because there needs to be a little more information for me to answer
What is the slope of the line that passes through the points (1, 3) and (5, –2)?
C.-5/4
slope = (-2 -3)/(5 -1) = -5/4
2.The sum of two consecutive odd integers is 80. What is the smaller number?
C.39
odd : 39 +41 = 80
39 is the smaller odd number