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
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Add.-48 + 56
A. -8 B. 104 C. 8 D. -104
Use a proportion to solve the problem.On a map of the Fox River, 1 centimeter represents 5 kilometers. If a trail by the river is actually 22.00 kilometers long, what is the length of the river on the map?
A. 12 cm B. 4.4 cm C. 17 cm D. 6.4 cm
Solve the quadratic equation using the most efficient technique (factoring, extracting square roots, completing the square, or the quadratic formula).(4x + 1)2 = 17
A. 
B. {-1 ± 
}
C. 
D. 
If necessary, write the equation in the standard form ax2 + bx + c = 0. Then identify the values of a, b, and c. Do not actually solve the equation.8x2 = 7x
A. a = 8, b = 0, c = 7 B. a = 8, b = -7 C. a = 8, b = -7, c = 0 D. a = 3, b = 7, c = 0