Answer:
The most common measure of an angle is in degrees. Here is a brief introduction to the four types of angles: Right angle. With this angle, you can never go wrong. The right angle is one of the most easily recognizable angles. It’s in the form of the letter L, and it makes a square corner (see Figure 2). It has a measure of 90 degrees.
Step-by-step explanation:
 
        
             
        
        
        
Hey there! 
4.50x + 5.50x - 7.50x
= 4.5x + 5.5x - 7.5x
= 10x - 7.5x 
COMBINE the LIKE TERMS 
= (10x - 7.5x)
= 10x - 7.5x
= 2.5x 
≈ 2.50x 
Therefore, your answer is: 2.50x
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)
 
        
             
        
        
        
Vertical Angles: Theorem and Proof
Theorem: In a pair of intersecting lines the vertically opposite angles are equal. It can be seen that ray \overline{OA} stands on the line \overleftrightarrow{CD} and according to Linear Pair Axiom, if a ray stands on a line, then the adjacent angles form a linear pair of angles.
        
             
        
        
        
Y=1/9(-1)+4 
Explanation:
X=-1 and y=8