The General Manager of the Service Department of MCA Television Company has estimated that the time that elapses between the dates of purchase and the dates on which the 19-in. sets manufactured by the company first require service is normally distributed according to the probability density function
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where x is measured in months. Determine the percentage of sets manufactured and sold by MCA that may require service 90-100 mo after purchase.
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Round the answer to the nearest hundredth, if necessary.
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__________%
Fill in the blank(s) with the appropriate word(s).
15.85
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Decide where the first digit in the quotient would be located. Then without finishing the division, determine which of the three choices is the correct answer.
A. 4580 B. 458 C. 46
Rationalize the denominator and simplify. 
A. 
B. 
C. 
D. 
Solve the problem.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). By using linear regression, the following function is obtained: 
where x is the cost of advertising (in thousands of dollars) and y is number of products sold (in thousands). Use this function to predict the number of products sold if the cost of advertising is $7000. Round to the nearest hundredth.
A. 82.03 B. 72.33 C. 19,585.8 D. 75.33
Solve the system.x2 + 2xy + y2 = 9x2 + 2xy - y2 = -9
A. {(0, 3), (0, -3), (6, 3), (6, -3)} B. {(0, 3), (0, -3), (6, 3), (-6, -3)} C. {(0, 3), (0, -3), (-6, 3), (-6, -3)} D. {(0, 3), (0, -3), (-6, 3), (6, -3)}