Find the focus and directrix of the parabola.y2 = -4x
A. (1, 0); x = -1
B. (0, -1); y = 1
C. (-1, 0); y = 1
D. (-1, 0); x = 1
Answer: D
Mathematics
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Completely factor the expression.
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?
A. 
B. 
C. 
D. 
E. 
Mathematics
By how much did the price of a sofa decrease if the regular price of $2,266 was reduced by 50%?
A. 45 B. 1133 C. 1133 D. 2266
Mathematics
It is estimated that one third of the general population has blood type A=. If a sample of nine people is selected at random, what is the probability that at most three of them have blood type A+.
a. 0.650 b. 0.646 c. 0.647 d. 0.649 e. 0.658
Mathematics
Simplify the radical expression. Assume that all variables represent positive real numbers.
A. 2k7q8 
B. 2k3q4 
C. 2k3q4 
D. 2q4 
Mathematics