Find the focus and directrix of the parabola.x2 + 8y = 0
A. F: (0, -2); D: y = -2
B. F: (0, -2); D: x = 2
C. F: (0, -2); D: y = 2
D. F: (-2, 0); D: y = 2
Answer: C
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Solve.The population growth of an animal species is described by F(t) = 600 + 70 log3(2t + 1) where t is measured in months. Find the population of this species in an area 40 month(s) after the species is introduced.
A. 6270 B. 3155 C. 450 D. 880
Solve the problem.Given the following voter profile, determine which candidate (if any) is a Condorcet Candidate and who will be selected using the Plurality Method. Does the Plurality Method violate the Condorcet criterion for the voter profile? 
A. a, b; yes B. b, a; yes C. a, a; no D. b, b; no
Use the pH scale to solve the problem. Use the given concentration [H+] of a substance to calculate the pH value of the substance and classify the substance as an acid or a base. Round to two decimal places.[H+] = 2.1 × 10-4
A. pH ? 6.68, acid B. pH ? 4.32, base C. pH ? 0.84, acid D. pH ? 3.68, acid
Perform the computation and give answer with the appropriate number of significant digits.0.0528 + 0.14 sec (85.4°)
A. 1.798 B. 0 C. 1.8 D. 0.8