M<AVC = 43 degrees, because it is the angle's measure is 1/2 of the arc's
        
             
        
        
        
Answer:
4y²−38y−20
Step-by-step explanation:
(y−10)(4y+2)
=(y+−10)(4y+2)
=(y)(4y)+(y)(2)+(−10)(4y)+(−10)(2)
=4y²+2y−40y−20
=4y²−38y−20
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That they are not congruent