- What is 9/20 in decimal form?

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I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? 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? 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)? What about oxidation reaction charge? Is three days enough to study for a calculous test?