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What is x1+x2+x1*x2 means? 10.0mL of 0.500M H2SO4 is mixed with 90.0mL of 0.100M Pb(NO3)2. How much solid will be produced? Solve the equation using the quadratic formula. 3x^2=2(2x+1)? I need to know the following. What is the anatomical location of the elbow in reference to the sternum? Compound rate x1+x2+x1*x2?