- Math help. Lattices?

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When point charges q1 = +2.1 μC and q2 = +9.4 μC are brought near each other, each experiences a force of 0.15 N. Distance between charge? What is the enswer for the equation y=x+4and x+y=2? Simplify and write each answer in standard form
1. (x^2-7x+2) + (-5x^2+5x-9)
2. (3x^2-7x+10) - (x^2+4x-1)? How to do a plus minus sign on a ti 84 plus ce graphind calculator? Most types of virus particles show which types of symmetries?