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A 500 mL sample of water is found to contain 0.02 g of Pb. What is the concentration of Pb in the solution? When potassium and sulfur react to produce an ionic compound, how many total electrons are transferred for each formula unit? Need help. Trig? Please HELP!!!!!! Two-digit natural numbers are formed, with replacement, from the digits 0 through 9. How many numbers are greater than 57? F(x, y) = (1 + 5xy)^(3/2) then nabla(f( x, y) is?