- When going from hypertonic to isotonic, what changes more: concentration or cell shape?

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7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? 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)? Make a conjecture about the next item in the sequence.1, -4, 9, -16,?