In math, a factor is a number being multiplied; for instance, if 7x5=35, 7 and 5 are both factors. 
        
             
        
        
        
Answer:
4x + 2x = 90 NOT 180.
Step-by-step explanation:
x = 15 is the correct answer.
 
        
             
        
        
        
Answer:
X = 80°
Step-by-step explanation:
55+45=100
180-100=80 angles in a triangle=180°
So Y = 80 
and Y=X because opposite angles around a point are equal
 
        
             
        
        
        
Answer:
D.) x - 4
Step-by-step explanation:
This is a graph of an exponential/quadratic function. There general structure looks like this:
ax² + bx + c
Generally, when finding the zeros these functions, you are told to factor the equation. Once you have factored the equation, you can set the factors equal to zero to find the points where the function touches the x-intercept.
That being said, you can determine the factors without having the entire equation by identifying the zeros on the function. On this graph, there is a zero at (4,0). This means that one of the factors must have been "x - 4". You can check your work by setting the factor equal to zero.
x - 4 = 0
x = 4