Solve the problem.Christine is currently taking college astronomy. The instructor often gives quizzes. On the past seven quizzes, Christine got the following scores. Find the standard deviation.50?20?42?29?19?48?71

A. 18.7
B. 11,120.1
C. 42
D. 13,211


Answer: A

Mathematics

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A. 30.0 cm B. 31.0 cm C. 33.3 cm D. 18.0 cm

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Find the solution to the system of equations by substitution.-4x + y = 25-5x + 2y = 32

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A. x ?  or x ? 3
B.  ? x ? 3
C. x > 3
D. x ? 

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Differentiate.f(x) = tan(cos x)

A. tan(-sin x) B. -sin x sec2(cos x) C. tan(cos x) sec(cos x) D. sec2 (cos x) E. none of these

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