-0.8x+40-8x-35
(Collect like terms)
-8.8x+40-35
(Subtract the numbers)
=-8.8x+5
        
                    
             
        
        
        
Answer:
70°
Step-by-step explanation:
every triangle has a total of 180°, therefore 180-80-30=70°
i apologize if my answer is incorrect!
 
        
             
        
        
        
Answer: Length of shorter tree = 7.2 feet .
 
Step-by-step explanation:
Given : Height of two trees as 50 feet and 20 feet.
At same time the angle made by sun rays would be same for both trees.
Both trees are vertical to the ground making right angle so triangles made by both triangles must be similar.
Corresponding sides of similar triangles are proportional.
So 
So, Length of shorter tree = 7.2 feet .
 
        
             
        
        
        
-8 and -9 because it is negative
        
             
        
        
        
Https://mathbitsnotebook.com/Algebra1/RealNumbers/RNProp.html