Find the focus and directrix of the parabola with the given equation.5y2 = -4x
A. Focus: 
, directrix: x = 
B. Focus: 
, directrix: x = - 
C. Focus: 
, directrix: y = 
D. Focus: 
, directrix: y = 
Answer: A
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Simplify the expression. Assume that all variables are positive when they appear.
A. -3x21 B. -3x18 C. 3x7 D. -3x7
Perform the indicated operation.
A. 21
B. -21
C. 
D. - 
Given that line l is parallel to line m, identify the specified angles.All pairs of corresponding angles. 
A. ?1 and ?7; ?2 and ?8; ?4 and ?6; ?3 and ?5 B. ?1 and ?8; ?2 and ?7; ?4 and ?5; ?3 and ?6 C. ?3, ?4 , ?5, and ?6 D. ?1 and ?5; ?2 and ?6; ?4 and ?8; ?3 and ?7
Write out the first five terms of the sequence.{sn} = {2n - 1}
A. s1= 3, s2= 5, s3= 7, s4= 9, s5= 11 B. s1= 1, s2= 3, s3= 5, s4= 7, s5= 9 C. s1= 1, s2= 2, s3= 3, s4= 4, s5= 5 D. s1= -1, s2= -3, s3= -5, s4= -7, s5= -9