Find the center and radius of the circle.x2 + y2 + 2x + 4y = 4
A. (-1, -2), r = 3
B. (-2, -1), r = 3
C. (2, 1), r = 9
D. (1, 2), r = 9
Answer: A
Mathematics
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Solve the equation.
- 
= 
A. 2 B. 7 C. -2 D. No solution
Mathematics
Decide whether the figure is convex or concave.
A. Concave B. Convex
Mathematics
Find an equation of a parabola satisfying the given conditions.Focus at (8, 3), directrix y = -1
A. (x - 3)2 = 8(y - 1) B. (x - 8)2 = 8(y - 3) C. (y - 3)2 = 8(x - 8) D. (x - 8)2 = 8(y - 1)
Mathematics
Determine whether or not the function is one-to-one.
A. Yes B. No
Mathematics