C, B, G  common vortex ( B) and common side (C, G) 
        
             
        
        
        
Answer: the length of string that been let out to fly the kite this high is 172.89 ft
Step-by-step explanation:
The length of string attached to the kite, the vertical height of the kite above the ground and the ground distance forms a right angle triangle.
With an angle of 57 degrees, the length of the string that is attached to the kite represents the hypotenuse of the right angle triangle.
The height of the kite above the ground represents the opposite side of the triangle
To determine h, the length of the string that has been let out to fly the kite this high, we would apply the 
Sine trigonometric ratio which is expressed as 
Sine θ = opposite side/hypotenuse 
Sin 57 = 145/h
h = 145/Sin57 = 145/0.8387
h = 172.89
 
        
             
        
        
        
Please take 1 minute, and really read the example solution 
under problem #12.  All of the other eight problems on the 
sheet are solved in exactly the same way:
Multiply each side of the equation by the denominator of 
the fraction ... the number under the variable (the letter).
This easy step will get you the answer to each of the 
eight problems.
I can't help noticing that the title of the sheet is 'extra PRACTICE' .
If someone handed you the answers, then you would not get the 
practice.  That would be just like stealing from you, and would be
just plain mean.
        
             
        
        
        
Answer:
3/20
Step-by-step explanation:
1/1-1/4-3/5= (money spent)
1×4×5/(1×4×5)-1×1×5/(1×4×5)-3×1×4/(1×4×5)
20/20-5/20-12/20
(20-5-12)/20=3/20
 
        
                    
             
        
        
        
This is  equal to 0 = 4x^2 -8x+7  which is a parabola.    I don't know what desmos is so I can't help  you with that