Find an equation of the parabola described.Focus at (0, 21); directrix the line y = -21
A. x2 = 84y
B. y2 = 21x
C. x2 = -84y
D. y2 = 84x
Answer: A
Mathematics
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Find the missing dividend or divisor.
= -2x6
A. -5x2 B. -5x C. 5x2 D. -5
Mathematics
Graph the equation and give the coordinates of the vertex.y = -x2 - 4x - 3
A. (-2, 1)
B. (-2, -1)
C. (-0.5, 3.25)
D. (2, 1)
Mathematics
Evaluate.|23|
A. 23 B. 0 C. -23 D. 46
Mathematics
Find the value of c for which the expression is a perfect-square trinomial. Then factor the perfect-square trinomial.x2 + 5x + c
A. 
; 
2
B. - 
; 
2
C. 
; 
2
D. 10; (x + 5)2
Mathematics