- Math word problem, please help thanks?

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What is the solution set for x^2 + 4 = 6x? How many crewmen on a submarine? Find the sum to n terms of the series, 2+4(1/5)+6(1/5)²...,and deduce the sum to infinity.? When potassium and sulfur react to produce an ionic compound, how many total electrons are transferred for each formula unit? Please HELP!!!!!! Two-digit natural numbers are formed, with replacement, from the digits 0 through 9. How many numbers are greater than 57?