National Welding Company uses industrial robots in some of its assembly-line operations. Management has determined that the lengths of time in hours between breakdowns are exponentially distributed with probability density function 
.
?
What is the probability that a robot selected at random will break down between 400 and 500 hr of use? Round your answer to the nearest hundredth.
?
A. 0.06
B. ?0.30
C. ?0.15
D. ?0.79
E. ?0.51
Answer: A
Mathematics
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Solve the equation.60 - 
= 
A. 
B. 
C. {4}
D. {224}
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Evaluate and simplify completely. Write your answer as a mixed number if possible.4
÷ 11
A. 
B. 
C. 
D. 
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Write the rational expression in lowest terms.
A. 1
B. 3
C. 
D. 
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Estimate the value as a whole number or as a mixed numeral where the fractional part is 
.87
? 98
A. 8627
B. 8516
C. 8526
D. 8627
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