Write the number in scientific notation.0.000000047009
A. 4.7009 × 108
B. 4.7009 × 10-7
C. 4.7009 × 10-8
D. 4.7009 × 10-9
Answer: C
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Solve the problem.In the following formula, y is the minimum number of hours of studying required to attain a test score of x: 
How many hours of study are needed to score 89? Round your answer to the nearest hundredth, if necessary.
A. 38.70 hr B. 100.93 hr C. 3.87 hr D. 7.16 hr
Express the sum using summation notation.3 + 6 + 9 + ... + 21
A. 
B. 
C. 
D. 
Use a graphing calculator to plot the data and find the quadratic function of best fit.The following table shows the median number of hours of leisure time that Americans had each week in various years.
Use x = 0 to represent the year 1988. Using a graphing utility, determine the quadratic regression equation for the data given. Round values to the nearest hundredth. What year corresponds to the time when Americans had the least time to spend on leisure?
What will be an ideal response?
Solve the problem.An experienced bank auditor can check a bank's deposits twice as fast as a new auditor. Working together it takes the auditors 4 hours to do the job. How long would it take the experienced auditor working alone?
A. 8 hr B. 12 hr C. 4 hr D. 6 hr