Fill in the blank with one of the words or phrases listed below.
The 
of a list of rational expressions is a polynomial of least degree whose factors include all factors of the denominators in the list.
A. unit
B. least common denominator
C. complex fraction
D. rational expression
Answer: B
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Solve the problem.A researcher finds a negative correlation between blood pressure and the number of vacations that people take. Can you conclude that taking vacations lowers blood pressure? Propose other explanations for the correlation. Suggest some ways that the researcher could go about establishing causality. Refer to the six guidelines for establishing causality.
What will be an ideal response?
This double-bar graph shows the number of male (M) and female (F) athletes at a university over a four-year period. Answer the question.
How many students were involved in athletics in Year 4?
A. 750 B. 825 C. 775 D. 800
Find the length of the arc intercepted by a central angle ? in a circle of radius r. Round your answer to three decimal places when necessary.? = 
, r = 5 ft
A. 2.618 ft B. 9.549 ft C. 5.236 ft D. 3.77 ft
Solve the problem.Martha can rake the leaves in her yard in 5 hours. Her brother can do the job in 2 hours. How long will it take them to do the job working together?
A. 3
hours
B. 
hours
C. 1
hours
D. 
hours