- Find integers x and y such that 57x+79y=17, and 400

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If you started with 3.60g of Copper and reacted it with an excess of nitric acid what mass of copper hydroxide would you expect to recover? How can i determine crop coefficient of constructed wetland macrophytes? What is the partial pressure of N2 in a mixture of N2 and O2 having a total pressure of 1075 torr if the partial pressure of O2 is 720 torr? Is it true that the oxidation number of an ion is equal to its protons subtracting its electrons? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)?