Write the complex number in rectangular form.9(cos 180° + i sin 180°)
A. -9i
B. 9i
C. -9
D. 9
Answer: C
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Evaluate the function.Find f(-4) when f(x) = 5x2 + 5x - 7.
A. 67 B. 93 C. -11 D. 53
Find 
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, 
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A. 
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B. ??
C. 
D. 
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E. 
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The cost of producing Widgets is $1.25 per Widget plus a fixed cost of $2000.
(a) What is the cost of producing 50 Widgets? 100 Widgets? (b) Write an equation expressing the cost of production, C, in terms of the number of Widgets, w, produced. (c) What is the slope of the line this equation describes? (d) What is the total cost of producing 7436 Widgets?
Find the vertex, focus, and directrix of the parabola with the given equation.(x - 1)2 = 20(y + 4)
A. vertex: (1, -4) focus: (1, 1) directrix: y = -9 B. vertex: (-4, 1) focus: (-4, 6) directrix: y = -4 C. vertex: (-1, 4) focus: (-1, 9) directrix: y = -1 D. vertex: (1, -4) focus: (1, -9) directrix: x = 1