A linear function can’t repeat but a quadratic function can
 
        
             
        
        
        
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Answer: 24$
Explanation: 
72 / 6 = 12$
12$ for 1 ticket
12 x 2= 24$ for 2 tickets
I hope this helped!
<!> Brainliest is appreciated! <!>
- Zack Slocum
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we can divide the composite shape into on quadrilateral and triangle as shown in the diagram. since the line that joins the two shape is parallel to the base AB, the angle DEC is 85°.The angle CEA is 180°- angle DEC = 180-85=95. Angle BCE is sum of angle CEA, ABC and EAB subtracted from360°= 360°-(95+95+85)=85°. Angle DCE is 120°- ECB=35°. So, angle CDE = 180°-(35°+85°)= 60°. For reference see the diagram. 
 
        
             
        
        
        
I think that the answer is C
        
             
        
        
        
x + y  = 24       where x and y are the 2 parts of diagonal Other diagonal wil be smaller that 24. 
x^2 + z^2 = 13^2
y^2 + z^2  = 20^2            where z  = 0.5 * length of smaller diagonal)
form last 2 equations
y^2 - x^2  = 20^2 - 13^2  =  231
 now y = 24-x so we have
(24 - x)^2    - x^2 = 231
576 - 48x = 231
48x = 345
x =  7.1875
z^2  =  13^2 - 7.1875^2 =  117.34
z =  1.83
so smaller diagonal = 21.66 cm
looks like its the third choice.