Solve the problem.The algebraic expression 
describes the duration of a storm, in hours, whose diameter is d miles. Use a calculator to determine the duration of a storm with a diameter of 8 miles. Round to the nearest hundredth.
A. 0.42 hr
B. 0.2 hr
C. 22.63 hr
D. 1.58 hr
Answer: D
Mathematics
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Find the mean of the set of data.2, 19, 14, 20, 19, 19, 14, 5
A. 7 B. 12 C. 16 D. 14
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Evaluate the improper integral or state that it is divergent.
A. 0
B. 
C. - 
D. Divergent
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Determine the vertex of the graph of f.f(x) = (x - 6)2
A. (-6, 0) B. (6, 0) C. (0, -6) D. (0, 6)
Mathematics
Use the quadratic formula to solve the quadratic equation.x2 = -4x + 21
A. x = -7, 3 B. x = -7, - 3 C. x = 7, - 3 D. x = -21, 0
Mathematics