Answer the question.If we are looking for the critical points (a,b) on the surface of 
then we study the tangent lines to (a,b) along the slices parallel to the 
and 
These tangent lines must have which of the following properties?(i) They must be perpendicular.(ii) They must be horizontal.(iii) They must be horizontal, but not perpendicular.(iv) They must be perpendicular, but not horizontal.
A. Only (iii) is correct.
B. Only (iv) is correct.
C. Both (i) and (ii) are correct.
D. Only (ii) is correct.
Answer: C
Mathematics
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A. 3x4 - 18x3 + 19x2 + 4x - 4 B. 3x4 - 18x3 + 21x2 + 4x - 4 C. 3x4 - 15x3 + 21x2 + 4x - 4 D. 3x4 - 15x3 + 19x2 + 4x - 4
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Add.-2 + 7
A. -5 B. -9 C. 5 D. 9
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Convert the area as indicated.2.5 square decimeters to square centimeters
A. 0.25 cm2 B. 2500 cm2 C. 25 cm2 D. 250 cm2
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Complete the identity.sin 
= ?
A. -sin x B. sin x C. cos x D. -cos x
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