Find the LCD for the fractions in the list.
, 
A. q + p
B. p2 + q2
C. p2 - q2
D. p - q
Answer: D
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Determine the value of the variable so that the equality is a proportion.
= 
A. 7.71 B. 6.71 C. 13.42 D. 5.545
Calculate the value mentally.
A. 1,000 B. 100 C. none of these D. 10
Calculate the number of distinguishable strings that can be formed with the stated letters.5 m's and 5 n's
A. 10 B. 642 C. 252 D. 25
Solve the problem.A woman counts the number of emails she receives every day. Let the random variable X be the number of emails she receives in a day, which is always between 2 and 6. She calculates the probability mass function to be 
for 
Find ? and explain what this number represents.
A. ? = 4.67 is the average number of emails she gets per day B. ? = 4.67 is the fewest emails she could get in a day C. ? = 4 is the most emails she could get in a day D. ? = 2 is the average number of emails she gets per day