102
the angles are alternate so they add up to 180
180-78=102
hope this helps :)
if you need me to explain more just let me know :)
        
             
        
        
        
Answer:
X^3 + x^2 + x
Step-by-step explanation:
First, distribute the negative sign to the numbers in the second parentheses. Then you’ll need to combine like terms. 
 
        
             
        
        
        
Answer:
Step-by-step explanation:
so confused right now
 
        
                    
             
        
        
        
Answer:
4
Step-by-step explanation:
4 because 4^2 = 16.
 
        
             
        
        
        
Answer:  proof below
<u>Step-by-step explanation:</u>
Use the Difference formula for sin:
   sin (A - B) = sin(A)·cos(B) - cos(A)·sin(B)
sin (180° - θ) = sin(180°)·cos(θ) - cos(180°)·sin(θ)
                     =       0  · cos(θ)    -      -1  · sin(θ)
                     =              0           -           -sin(θ)
                     =                         + sin(θ)
sin (180° - θ) = sin(θ)  