- Subtract (9c^5-2c^2+19) from (5c^5+4c^2-4)?

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Calculate the mass percent of a solution that is prepared by adding 41.4 g of NaOH to 282 g of H2O.? A 887 mL NaCl solution is diluted to a volume of 1.30 L and a concentration of 3.00 M . What was the initial concentration C1? Calculate the mass/volume percent of a NaCl solution in which 184 g of NaCl is dissolved in enough water to give a total volume of 3.18 L .? What minerals is quartz composed of? Thank you!!!!? How do I prove that if x is positive that sin(x) < x?