Solve the problem.Suppose the total cost C(x) to manufacture a quantity x of insecticide (in hundreds of liters) is given by 
. Where is C(x) decreasing?
A. (0, 500)
B. (8, 10)
C. (10, 500)
D. (8, 500)
Answer: B
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Solve the problem.If v = -2i - 4j + k and u = 2i - 5j + 5k, find a vector perpendicular to both v and u.
A. 20i + 27j + 19k B. 7i + 3j + 26k C. -15i + 12j + 18k D. -7i - 3j + 3k
Evaluate the surface integral of G over the surface S.S is the hemisphere x2 + y2 + z2 = 5, z ? 0; G(x,y,z) = z2
A. 
?
B. 
?
C. 100?
D. 
?
Solve the problem.The cost of manufacturing clocks is given by c = 9
dollars, where c is the total cost and n is the number produced. What is c when no clocks are produced?
A. $9 B. $81 C. $27 D. $729
Use a differential to approximate 
.
?
Round the result to five decimal places, if necessary.
?
Hint: Let 
and compute dy with x = 16 and dx = 0.01.
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Fill in the blank(s) with the appropriate word(s).