A laboratory technician records the life span (in months) of rats treated at birth with a fertility hormone. From the following frequency distribution, find the sample standard deviation of life span.
Life span (months)Midpoint xFrequency fProduct xf-0.5 - 2.5 11 2.5 - 5.5 20 5.5 - 8.5 21 8.5 - 11.5 29 11.5 - 14.5 19 Please round your answer to the nearest whole number, if necessary.__________ months
Fill in the blank(s) with the appropriate word(s).
Answer: 4
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Graph.y = x3 - 3
A. 
B. 
C. 
D. 
Find the balance due on the maturity date of the note. Find the total amount of interest paid on the note. Use the United States Rule.Principal: $8200Interest: 10.5%Time (days): 220Partial payment: $3000 on day 150
A. $5713.71; $513.71 B. $5102.08; $460.83 C. $5672.24; $472.24 D. $5306.17; $464.92
Fill in the blank with one of the words or phrases listed below. Choices may be used more than once or not at all.
In a system of linear equations in two variables, if the graphs of the equations are different, the equations are 
equations.
A. inconsistent B. consistent C. independent D. dependent
Solve the problem.Find cos ?, given that cos 2? = 
and ? terminates in quadrant I.
A. 
B. 
C. 
D. 