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D. 2s^2+ 8s -10= 0 Because, for me this equation is an example of a Quadratic because it has a degree of 2 and the Quadratic formula is ax^2+bx-c=0 and in this problem 2s^2 symbolizes as the ax^2 then 8s symbolizes as bx and -10 symbolizes as the c therefore my answer is D. I hope i\my answer will help you :) 
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