Perform the indicated operation. Assume that all variables represent positive numbers.
? 
A. 2
B. 2
C. 
D. 10
Answer: B
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Find the required limit or indicate that it does not exist.
[9ti - t2j]
A. -2i - 49j B. 63i - 49j C. 16i - 49j D. 63i - 7j
Solve the equation.0.31(x + 20) + 0.42(x + 85) = -34.75
A. {65} B. {-105} C. {105} D. {-65}
Solve the problem.The five sales people at Southwest Appliances earned commissions last year of 
, 
, 
, 
, and 
. What is the mean of these commissions?
A. $28,140 B. $29,480 C. $25,460 D. $26,800
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. What are Mr. Cameron's expected concert earning?
A. $300,000 B. $360,000 C. $60,000 D. $218,400