Find the weighted mean of the numbers in the table. Round to the nearest tenth.Five rats were inoculated against a disease. After an incubation period, the number of rats contracting the disease was noted. The experiment was repeated 20 times, with the results shown in the table.
A. 2.3 rats
B. 2.7 rats
C. 3.1 rats
D. 2.4 rats
Answer: A
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Find the area of the surface generated by revolving the curve about the indicated axis. y = 
, 3/2 ? x ? 9/2; x-axis
A. 
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B. 
?
C. 
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D. 
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Solve the problem.A certain company has found that its expenditure rate per day (in hundreds of dollars) on a certain type of job is given by 
where x is the number of days since the start of the job. Find the expenditure if the job takes 6 days.
A. $8400 B. $2600 C. $84 D. $26
Provide an appropriate response.The region shown here is to be revolved about the line x = 3 to generate a solid. Which of the methods (disk, washer, shell) could you use to find the volume of the solid? How many integrals would be required in each case?x = - y2 
What will be an ideal response?
Find the area of the geometric figure.
A. 44.5 sq m B. 59.5 sq m C. 38.25 sq m D. not enough information given