Express the sum using summation notation. Use a lower limit of summation not necessarily 1 and k for the index of summation.
+ 
+ 
+ 
+ . . . + 
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem.Find the mode for the scores: 5, 9, 21, 3, 2, 8, 46, 1, 4, 16.
A. 9 B. no mode C. 10.9 D. 8
Solve the problem.Boyle's law states that if the temperature of a gas remains constant, then PV = c, where P is the pressure, V is the volume, and c is a constant. Given a quantity of gas at constant temperature, if V is decreasing at a rate of 12 in.3/s, at what rate is P increasing when P = 50 lb/in.2 and V = 80 in.3?
A. 
lb/in.2-s
B. 
lb/in.2-s
C. 
lb/in.2-s
D. 
lb/in.2-s
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083
Solve the system of equations using substitution.
A. x = 6 , y = -6; x = -5, y = 5
or (6, -6), (-5, 5)
B. x = -6 , y = - 
; x = 5, y = 
or 
, 
C. x = - 
, y = -6; x = 
, y = 5
or 
, 
D. x = 
, y = 5 or 