Match the graph to one of the listed functions. 
A. f(x) = -x2 + 6x
B. f(x) = x2 + 6x
C. f(x) = x2 + 6
D. f(x) = -x2 + 6
Answer: C
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Solve the problem.A researcher finds a positive correlation between the amount of coffee people drink and anxiety level. Can you conclude that drinking coffee causes anxiety? Propose other explanations for the correlation. Suggest some ways that the researcher could go about establishing causality. Refer to the six guidelines for establishing causality.
What will be an ideal response?
Perform the indicated operation and express with the proper accuracy and precision. The first number given is approximate and the second number is exact. (Use calculator if needed).0.3073 + 19.7
A. 20.0073 B. 20 C. 20.0 D. 20.01
A delivery truck must deliver packages to 5 different store locations (A, B, C, D, and E). The trip must start and end at D. The graph below shows the distances (in miles) between locations. We want to minimize the total distance traveled.
The repetitive nearest-neighbor tour starting with vertex D is given by:
A. D, C, A, B, E, D. B. D, B, E, C, A, D. C. D, A, B, E, C, D. D. D, E, A, B, C, D. E. none of these
Solve the problem.A carbon-14 dating test is performed on a fossil bone, and analysis finds that 15.5% of the original amount of carbon-14 is still present in the bone. Estimate the age of the fossil bone. (Recall that carbon-14 decays according to the equation A = A0e-0.000124t).
A. 1,500 years B. 150 years C. 15, 000 years D. 15,035 years