Answer: b 1.20
Step-by-step explanation:
b 1.20
 
        
             
        
        
        
You have to replace d woth 3 in formula
7d^2+10=7*(3)^2+10=7*9+10=63+10=73
d is the correct answer
        
                    
             
        
        
        
1 would be B. 2 would be a
        
             
        
        
        
Angle aed has to be 80 since the two triangles share two of the same angles
 
        
        
        
So you want to solve for x? 
It would be nice if this would easily factor:
(-4x + 5)(2x +1)  = 0    This will not work!
So you need to use the quadratic formula:
a = -8, b = 4, c = 5

x = (-4 +/- 

)/2(-8)
   = (-4 +/- 

)/-16
   = (-4 +

)/-16
   = 1/4 - 

/4