Prove that (a-b) x (a+b)=2a x b is true.
(a and b are vectors)

Which of the following is the shape of a cross section of the figure shown below

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Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]