Find the difference. Simplify the result.
- 
A. 
B. 
C. 
D. 
Answer: B
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Find the mean for the given sample data. Unless otherwise specified, round your answer to one more decimal place than that used for the observations.The grocery expenses for six families were src="https://sciemce.com/media/4/ppg__ttt0612190950__f1q197g6.jpg" alt="" style="vertical-align: -4.0px;" />. Compute the mean grocery bill. Round your answer to the nearest cent.
A. $107.47
B. $71.64
C. $73.97
D. $85.97
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, 
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Solve the problem.The low temperature in city S yesterday was 32 degrees. For this month of the year, the average low temperature in city S is 
with a standard deviation of 7.8 degrees. The low temperature in city W yesterday was 48 degrees. For this month of the year, the average low temperature in city W is 38 with a standard deviation of 6.6 degrees. Find the z-score for each city. Relatively speaking, which city had the more unusual low temperature?
A. 1.0, 10.0, city S B. 0.13, 1.52, city W C. 0.13, 1.52, city S D. 1.0, 10.0, city W
By graphing the function, visually estimate its domain and range.h(x) = |x| - 1
A. Domain: [1, ?); range: [1, ?) B. Domain: (-?, ?); range: (-?, ?) C. Domain: (-?, 1]; range: (-?, 1] D. Domain: (-?, ?); range: [-1, ?)
Find an equivalent equation in polar coordinates.x2 + y2 - 4x = 0
A. r sin2? = 4 cos ? B. r cos2? = 4 sin ? C. r = 4 cos ? D. r = 4 sin ?