Find the standard deviation.Lisa is currently taking an astronomy class. The instructor often gives quizzes. On the past seven quizzes, Lisa earned 47, 18, 36, 29, 15, 42, and 77. Find the standard deviation. Round your answer to one decimal place.
A. 20.9
B. 12,588
C. 36
D. 9,956.6
Answer: A
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Evaluate.log1/2 8
A. -3
B. 3
C. -2 ? ln (3)
D. 
The orbit of Hale-Bopp comet, discovered in 1995, is an ellipse with eccentricity 0.995 and one focus at the Sun. The length of its major axis is 366.5 AU. [An astronomical unit (AU) is the mean distance between Earth and the Sun, about 93 million miles.] Find the maximum distance from the comet to the Sun. (The perihelion distance from a planet to the Sun is a(1 - e) and the aphelion distance is a(1 + e). Find the answer in AU and round to the nearest hundredth.
What will be an ideal response?
Use the following graph which shows the monthly sales of a heating supplier. 
What was the percent of decrease in sales from April to June?
A. 20.7% B. 17.1% C. 43% D. 14.3%
Solve the equation.2 ln 4x = 12
A. 
B. {e6}
C. 
D. 