Find the focus and directrix of the parabola.y2 = -40x
A. (-10, 0); y = 10
B. (10, 0); x = -10
C. (-10, 0); x = 10
D. (0, -10); y = 10
Answer: C
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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. 400 pretzels B. 200 pretzels C. 100 pretzels D. 800 pretzels
Use the graph to answer the question.The graph shows the number of students per 10,000 who are enrolled in the indicated programs at a major university. How many students per 1000 are enrolled in Law? 
A. 26.3 B. 263 C. 21.8 D. 131.5
Find all rational zeros of the polynomial.P(x) = 
x4 - 
x3 + 
x2 - 
x + 
A. 
, 
B. 
, 
C. - 
, 
D. 
, 
Determine the sign (positive or negative) of the given value without use of a calculator.cos 
A. Positive B. Negative