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
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What is the probability that a robot selected at random will break down between 500 and 800 hr of use? Round the answer to the nearest hundredth.
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__________
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What is the probability that a robot will break down after 1,100 hr of use? Round the answer to the nearest hundredth.
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__________
What will be an ideal response?
0.16; 0.33
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Graph the exponential function and state the domain and range.y = 
x
A. Domain: (-?, ?), Range: (-?, 0)
B. Domain: (-?, ?), Range: (0, ?) 
C. Domain: (-?, 0), Range: (-?, 0)
D. Domain: (0, ?), Range: (0, ?)
Solve the problem.Mardi received an inheritance of $70,000. She invested part at 9% and deposited the remainder in tax-free bonds at 4%. Her total annual income from the investments was $5300. Find the amount invested at 9%.
A. $25,000 B. $49,000 C. $64,700 D. $50,000
Verify the identity.sin3 x cos2 x = sin x (cos2 x - cos4 x)
What will be an ideal response?
Perform the indicated operation.
÷ 
A. 
B. 
C. 
D. 