A V8 car engine is coupled to a dynamometer and the horsepower y is measured at different engine speeds x (in thousands of revolutions per minute). The results are shown in the table below. Use the regression capabilities of a graphing utility to find a cubic model for the data. Round the numerical values in your answer to three decimal places, where applicable.
?????
x 12 3456?y4489144204229249??
A. 
B. 
C. 
D. 
E. 
Answer: D
Mathematics
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Express the repeating decimal as a quotient of integers. If possible, reduce to lowest terms.0.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Doug and Inga can deliver 100 papers in 2 hours. How long would it take them to deliver 145 papers?
A. 2.9 hr B. 290 hr C. 4.4 hr D. 1.4 hr
Mathematics
Provide an appropriate response.Determine the critical points of f(x, y) = 2xy - 3x - y - x2 - 3y2 and also determine by the second-derivative test whether each point corresponds to a relative maximum, to a relative minimum, to neither, or whether the test gives no information.
What will be an ideal response?
Mathematics
Verify the identity.
= 
What will be an ideal response?
Mathematics