Solve the problem.The profit that the vendor makes per day by selling x pretzels is given by the function 
Find the number of pretzels that must be sold to maximize profit.
A. 0.8 pretzels
B. 800 pretzels
C. 20 pretzels
D. 400 pretzels
Answer: D
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Find the center of mass of a thin plate covering the given region with the given density function.The region enclosed by the parabolas y = 18 - x2 and y = x2, with density ?(x) = x2
A. 
= 0, 
= 9
B. 
= 0, 
= 
C. 
= 9, 
= 0
D. 
= 0, 
= 18
The Boolean expression for a 3 input AND gate with inputs A, B, and C is:
a. ABC b. AB + C c. ÄÄ AB ú C d. Ä ABC e. A + B + C
Find the equation of the parabola corresponding to the given information.The parabola has focus and directrix as shown.
A. y = 
x2
B. y = - x2
C. y = - 
x2
D. x = 
y2
Find the vertex of the parabola, and determine whether the parabola opens upward, downward, to the left, or to the right.y = -(x - 1)2 - 1
A. (1, -1), down B. (0, -1), up C. (-1, 0), up D. (1, 1), down