Perform the indicated operation. Assume that all variables are nonnegative.
(
- 
)
A. x
- x
B. 10
- x
C. x
- 
D. 
- 
Answer: A
Mathematics
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Find the focus and the directrix of the parabola.y = 2x2 - 8x + 7
A. Focus: 
; directrix: y = - 
B. Focus: 
; directrix: y = - 
C. Focus: (2, 7); directrix: x = 9
D. Focus: (2, 1); directrix: x = -3
Mathematics
Use a trigonometric substitution to evaluate the integral.
A. 
sin-1 
+ C
B. tan-1 
+ C
C. 
tan-1 
+ C
D. 
ln 
+ C
Mathematics
Make the requested preference schedule.Ten voters are asked to rank 3 brands of shoes: A, B, and C. The ten voters turn in the following ballots showing their preferences in order:
Make a preference schedule for these ballots.
A. 
B. 
C. 
D. 
Mathematics
Find the average value of the function over the given interval.f(x) = -2x + 8 on [-8, 4]
A. 12 B. 24 C. 4 D. 144
Mathematics