Find the exact value of 
without using a calculator.
A. 
B. 
C. 
D. -1
E. 
Answer: C
Mathematics
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Provide an appropriate response.One pipe can fill a certain tank in 40 minutes. A second pipe can fill the same tank in 20 minutes. How long will it take to fill the tank if both pipes are used? Round to the nearest hundredth minute.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Write the imaginary number using i.-
A. -4
B. 4
C. 4i
D. -4i
Mathematics
When a company's core competencies are different from those held by competitors, those competencies are referred to as
A. distinctive competencies B. competitive advantages C. intangible competencies D. nonsubstitutable competencies
Mathematics
Evaluate the given binomial coefficient.
A. 28 B. 0 C. 8 D. 1
Mathematics