Solve the problem.Suppose a cost-benefit model is given by y = 
, where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 90% to the nearest dollar.
A. $9000
B. $69,300
C. $7700
D. $6930
Answer: B
Mathematics
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Find the center of mass of a thin plate covering the given region with the given density function.The region between the x-axis and the curve y = 
, 1 ? x ? 2, with density ?(x) = 
A. 
= 
, 
= 1
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Divide.324.3 ÷ 1000
A. 324,300 B. 32,430 C. 0.3243 D. 3.243
Mathematics
Solve the inequality, and graph the solution set.
? 0
A. [-7, 3] ? (4, ?)
B. [3, 4)
C. (-?, -7) ? (3, 4)
D. (-?, -7] ? [3, 4)
Mathematics
Find the equation in standard form of the parabola described.Vertex at (0, 0); Focus at (0, 8)
A. x2 = 32y B. y2 = 8x C. y2 = 32x D. x2 = -32y
Mathematics