Solve the problem.The weekly sales in thousands of items of a product has a seasonal sales record approximated by 
in weeks with 
referring to the first week in the year). During which 
will the sales equal 82,280 items?
A. week 4 and week 47
B. week 30 and week 47
C. week 21 and week 30
D. week 4, week 20, and week 52
Answer: D
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Adjust the problem so that the coefficient is in the proper form.45 × 104
A. 4.5 × 104 B. 4.5 × 103 C. 0.45 × 104 D. 4.5 × 105
Solve the problem.Find the center of mass of the hemisphere of constant density bounded 
and the 
A. 
= 0, 
= 0, 
= 
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 1
D. 
= 0, 
= 0, 
= 
Solve the problem.An auxiliary fuel tank for a helicopter is shaped like the surface generated by revolving the curve 
- 2 ? x ? 2, about the x-axis (dimensions are in feet). How many cubic feet of fuel will the tank hold to the nearest cubic foot?
A. 3 B. 8 C. 7 D. 2
Solve the problem.Mark Jakob lives in Tulsa, Oklahoma and plans to attend graduate school to earn his Ph.D. in chemistry. He wants to visit chemistry departments at schools in the following cities: Berkeley, California; Madison, Wisconsin, and Chicago, Illinois. The costs of the one-way flights between these four cities are as follows: Tulsa to Berkeley costs $604; Tulsa to Madison costs $510; Tulsa to Chicago costs $490; Berkeley to Madison costs $817; Berkeley to Chicago costs $699; Chicago to Madison costs $95. What is the minimum cost Mark can pay to visit all the schools and return to Tulsa?
A. $2006 B. $2516 C. $1210 D. $1908