Solve the problem.Suppose a cost-benefit model is given by 
where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 35% to the nearest dollar.
A. $2500
B. $1346
C. $875
D. $538
Answer: B
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Find the average value of the function f over the given region.f(x, y) = 10x + 6y over the triangle with vertices 
, 
, and 
A. 34
B. 
C. 
D. 
Determine whether the collection is not well defined and therefore not a set.The collection of frogs and toads currently in tanks at a nature center
A. well defined; set B. not well defined; not a set
Find the part.0.4% of 2000 trees
A. 80 trees B. 800 trees C. 0.8 trees D. 8 trees
Solve.A farmer's silo is the shape of a cylinder with a hemisphere as the roof. If the height of the silo is 62 feet and the radius of the hemisphere is r feet, express the volume of the silo as a function of r.
A. V(r) = 62?r2 + 
?r3
B. V(r) = ?(62 - r)r3 + 
?r2
C. V(r) = ?(62 - r) + 
?r2
D. V(r) = ?(62 - r)r2 + 
?r3