Find the focus and directrix of the parabola.x2 + 12y = 0
A. F: (-3, 0); D: y = 3
B. F: (0, -3); D: y = 3
C. F: (0, -3); D: y = -3
D. F: (0, -3); D: x = 3
Answer: B
Mathematics
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Graph the polar equation.r = 5(1 -sin ?)
A. 
B. 
C. 
D. 
Mathematics
Perform the indicated operation. Simplify, if possible.
+ 
- 
A. 
B. 
C. 
D. 
Mathematics
Solve by the method of elimination by substitution. x - 5y = 302x - 5y = 25
A. x = -4, y = -8 B. x = -5, y = -7 C. x = -4, y = -5 D. Inconsistent
Mathematics
Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula 
, as needed.Find the pH if [H3O+] = 7.9 × 10-3.
A. 2.9 B. 3.1 C. 2.1 D. 3.9
Mathematics