1st :The angle of depression 30° = the angle of elevation (from the truck to the height of the building.
2nd : 
cos 30° = (adjacent side)/(hypotenuse)
cos 30° = x/100, but cos 30°= (√3)/2
(√3)/2 = x/100 and x = (100√3)/2
and x = (50.√3) = 86.60 m
        
                    
             
        
        
        
Answer:
(2x • 5x) + (2x • -2)
Step-by-step explanation:
I think that's what you're looking for, you just distribute the 2x to both of the numbers in the parathesis
 
        
             
        
        
        
I’m going to use Pythagorus theorem for his question. // firstly I would do 20^2 + 16^2 = 656 // we them square root that number, so the square root of 656 is 25.61, meaning the missing length is 25.6
        
                    
             
        
        
        
Yes,  because the sum of any 2 sides of the triangle is greater than the value of the third side.