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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Solve the problem.A pendulum bob swings 6.0 cm on its first oscillation. On each subsequent oscillation the bob travels 
of the previous distance. Find the total distance the bob travels before coming to rest.
A. 30.0 cm B. 31.0 cm C. 33.3 cm D. 18.0 cm
Mathematics
Find the solution to the system of equations by substitution.-4x + y = 25-5x + 2y = 32
A. (1, -6) B. (-6, 1) C. (-5, 0) D. no solution
Mathematics
Solve the inequality using a sign chart.-7x2 - 6 ? -23x
A. x ? 
or x ? 3
B. 
? x ? 3
C. x > 3
D. x ? 
Mathematics
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
Mathematics