Estimate the interval(s) on which the function is increasing and decreasing.f(x) = -3x2 - 5x + 4
A. increasing on (-?, -2.26); decreasing on (-2.26, ?)
B. increasing on (-2.26, -0.83); decreasing on (-0.83, -2.26, ?)
C. increasing on (-?, -0.83); decreasing on (-0.83, ?)
D. decreasing on (-?, -0.83); increasing on (-0.83, ?)
Answer: C
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Find all specified roots.Eighth roots of i.
A. cis 
, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
B. 
+ 
i, 
- 
i, - 
+ 
i, - 
- 
i
C. 1, -1 ,i, -i, 
+ 
i, 
- 
i, - 
+ 
i, - 
- 
i
D. 1, -1, i, -i
Find the cross product and determine whether the proportion is true or false.
= 
A. 3120 = 3120; true B. 3120 ? 2700; false C. 2700 = 2700; true D. 8190 ? 360; false
Solve the problem.The stock market gained 17 points on Tuesday and lost 54 points on Wednesday. It had closed on Monday at 2563 points. Where did the market close on Wednesday?
A. 2600 points B. 2492 points C. 2634 points D. 2526 points
Simplify the expression.(
- 6
)(
+ 2
)
A. 
- 4
- 12
B. -563 - 4
C. 12
D. -79 - 4