Express the sum using summation notation with a lower limit of summation not necessarily 1 and with k for the index of summation.4 + 
+ 5 + 
+ ... + 10
A. 
B. 
C. 
D. 
Answer: D
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Without using a calculator, give the exact trigonometric function value with rational denominator.sec 30°
A. 
B. 
C. 1
D. 
Solve the system.
A. x = 6, y = -24, z = 16, w = -6 B. x = 1, y = -24, z = 8, w = -2 C. x = 1, y = -4, z = 16, w = -1 D. x = 1, y = -4, z = 4, w = -1
Solve.The earned run average (or ERA) is a statistic used in baseball to represent the average number of earned runs that a pitcher allows. A pitcher's ERA can be calculated using the expression 
, where E stands for the number of earned runs a pitcher gave up while getting O outs. Simplify this complex rational expression.
A. 
B. 
C. 
D. 
The following pictograph shows the number of bicyclists who participated in the Labor Day weekend bicycle race for the years 2003-2009. Use the graph to answer the question. 
What was the increase in the number of participants from 2007 to 2008?
A. 60 cyclists B. 70 cyclists C. 65 cyclists D. 75 cyclists