Find the focus and directrix of the parabola with the given equation.y2 = -9x
A. Focus: 
, directrix: x = 
B. Focus: 
, directrix: x = - 
C. Focus: (-9, 0), directrix: x = 9
D. Focus: 
, directrix: y = 
Answer: A
You might also like to view...
Express the function in terms of x.If f(u) = u5 and u = x3 + 8, then express 5u4 ? 3x2 in terms of x alone.
A. (15x5 + 8)4 B. 15(x5 + 8)4 C. x2(15x3 + 8)4 D. 15x2(x3 + 8)4
Solve the system of equations by graphing.
A. no solution B. (4, 1) C. (-1, 4) D. (4, -1)
Find the exact value, given that sin A = -4/5 with A in quadrant IV, 
with B in quadrant III, and 
with C in quadrant II.cos 2B
A. 
B. 
C. - 
D. - 
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083