Decide whether or not the given equation is an identity.sin2 ? - cos2 ? = 1 - 2 cos2 ?

A. Yes
B. No

Answer: A

Mathematics

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Solve using a system of two equations in two unknowns.Dmitri needs 5 liters of a 7% solution of sulfuric acid for a research project in molecular biology. He has two unlimited supplies of sulfuric acid solution: 5% solution and 10% solution. How many liters of each solution should Dmitri use?

A. 5% solution: 3 L, 10% solution: 2 L B. 5% solution: 3.5 L, 10% solution: 1.5 L C. 5% solution: 2.5 L, 10% solution: 2.5 L D. 5% solution: 2 L, 10% solution: 3 L

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Mathematics