- If f(x)=16-2x^2, then f(-3) equal? I got -2, is that correct?

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It takes me 8 hours to drain a tank of 5400 liters which is the mass flow in kilograms per second? Could another Ice Age occur in a near future? How to solve this inequation? 4 Fe(s) + 3O2(g) ->2Fe2O3(g). 27.3 g of iron reacts with 79.9 g of Oxygen. How many grams of the excess reactant remain after the reaction? Physics calculation about photoelectric?