1/2 because there is 7 girls and 7 boys in total
        
             
        
        
        
Answer:
x=45
Step-by-step explanation:
An entire triangle is 180 degrees and you already know that one angle is 90 degrees. 180 - 90 is 90. Now you have the equation 2x=90.
You then divide each side by 2 to get the x by itself which leaves you with x=45.
 
        
                    
             
        
        
        
57 m/h or mph
171 divided by 3 is 57
        
             
        
        
        
Answer:
   r = 5sec(θ)
Step-by-step explanation:
The usual conversion is ...
   y = r·sin(θ)
   x = r·cos(θ)
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The second of these can be used here.
   r·cos(θ) -5 = 0
   r·cos(θ) = 5
   r = 5/cos(θ) = 5sec(θ)
A suitable polar equation is ...
   r = 5sec(θ)