Answer:
120
Step-by-step explanation:
Split up the boxes to help you achieve the answer. 
 
        
             
        
        
        
Answer:
The angles are supplementary.
Step-by-step explanation:
Angles that add up to 90° are complementary, while angles that add up to 180° are supplementary.
 
        
             
        
        
        
Answer:

Step-by-step explanation:
First you need to find how many marbles there are in total, so 3+8+2= 13
The probability of the marble being red is  then
 then
Hope this helps! :)
 
        
                    
             
        
        
        
Answer:
=3a^3−2a^2−a−97
Step-by-step explanation:
 
        
             
        
        
        
Answer: Angle BEC is also 45 degrees.
Step-by-step explanation: This is because the opposite and congruent angle of BEC is 45 degrees. Congruent means the same. Therefore, Angle BEC is 45 degrees.