Find the vertex, focus, and directrix of the parabola.y2 = 16x
A. vertex: (0, 0)
focus: (4, 0)
directrix: x = -4
B. vertex: (0, 0)
focus: (0, 4)
directrix: y = -4
C. vertex: (0, 0)
focus: (-4, 0)
directrix: x = 4
D. vertex: (0, 0)
focus: (0, 4)
directrix: y = -4
Answer: A
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Solve the problem.A company predicts that sales will increase rapidly after a new product is released, with the number of units sold weekly modeled by N = 3000(0.1)0.5t, where t represents the number of weeks after the product is released. How many units per week were sold at the beginning of the campaign?
A. 360 units B. 3000 units C. 300 units D. 150 units
For the pair of functions, find the indicated sum, difference, product, or quotient.f(x) = 
, g(x) = 
Find 
(x).
A. x
B. 
C. 
D. 
Multiply.-9(-9)(-9)
A. -729 B. -739 C. -719 D. 729
Solve for the specified letter.w = 
, for x
A. x = w + z - y B. x = y - wz C. x = y + wz D. x = w - zy