Find the focus and directrix of the parabola with the given equation.3y2 = -4x
A. Focus: 
, directrix: y = 
B. Focus: 
, directrix: x = 
C. Focus: 
, directrix: y = 
D. Focus: 
, directrix: x = - 
Answer: B
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Multiply.Let P(x) = x2 - 7. Find P(x) ? P(x)
A. x4 - 14x2 + 49 B. x4 - 7x2 + 49 C. x4 - 7x + 49 D. x4 + 49
Fill in the blank with one of the symbols =, <, or > to produce a true statement.-7 ? -3
A. > B. = C. <
Use the change of base formula and a calculator to approximate the logarithmic expression. Round your answer to four decimal places.log2/319
A. -7.2619 B. 7.2619 C. 8.9261 D. -14.5225
Suppose that the function with the given graph is not f(x), but f'(x). Find the open intervals where the function is concave upward or concave downward, and find the location of any inflection points.
A. Concave upward on (-?, -2) and (2, ?); concave downward on (-2, 2); inflection points at -2 and 2 B. Concave upward on (-2, 2); concave downward on (-?, -2) and (2, ?); inflection points at -2 and 2 C. Concave upward on (-2, 2); concave downward on (-?, -2) and (2, ?); inflection points at -120 and 120 D. Concave upward on (-?, 0); concave downward on (0, ?); inflection point at 0