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Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Name a class of annelids whose members may have protonephridia? Is there a musical term for two independent, non-complementary, parts being played simultaneously? What about for three parts? Verify that M(u,v)=A +u(B-A) +v(C -A) ( A,B,C vectors) is a parametric representation of surface of the triangle A(1,0,0) B(0,-1,2) C(0,2,1)? Describe how and where new crust material is made. Describe how and where old crust is destroyed.?