Question 20 is 2/11 i believe
        
             
        
        
        
Equal to a+b on the algebra
        
             
        
        
        
Answer:
there are 36 girls 
Step-by-step explanation:
ratio is 3 to 4
 
        
             
        
        
        
The answer would be c I know cause I got it right on the test!
        
                    
             
        
        
        
Answer:
<em>The height of the tree is 19.81 m</em>
Step-by-step explanation:
<u>Trigonometric Ratios
</u>
The ratios between the sides of a right triangle are called trigonometric ratios. 
If any of the acute angles is chosen as a reference, it has an adjacent side and an opposite side. The trigonometric ratios are defined upon those sides and the hypotenuse.
The image shows a right triangle with a tree and the ground forming a right angle and an elevation angle of 33°.
This angle of 33° has a side of 30.5 m as its adjacent leg and the height of the tree X as the opposite side.
The trigonometric ratio that relates both legs is the tangent:

Solving for X

Using a calculator:
X = 19.81 m
The height of the tree is 19.81 m