The function is the Sine Curve
y = sine (x)
        
             
        
        
        
the angles the top part that has a square is 90⁰ and x and y are equal so we will name them both x and all angles together make 180⁰
I don't know about the sides
Step-by-step explanation:
90+x+x=180
2x=180-90
2x=90
x=90/2
x=45
 
        
             
        
        
        
<span>If y varies directly with x, the formula of the equation is y=ax, where a is a constant. 
 y=ax 
 (21)=a(7) 
 a=3 
 y=ax 
 y=(3)(-1.66) 
 y=-4.98, x=-1.66 
 If y varies inversely with x, the formula of the equation is y=a/x, where a is a constant 
 y=a/x 
 9=a/2.5 
 a=22.5 
 y=22.5/x 
 y=22.5/-0.6 
 y=-37.5 
I hope this helped! =)
I hope you didn't mind but I got this from a website called: answers.yahoo.com but I got your answer. 
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Answer:
It would be the third answer
Step-by-step explanation: