Granville and Preston are 528 miles apart. A car leaves Preston bound for Granville at 43 mph. At the same time, another car leaves Granville bound for Preston at 45 mph. How long will it take them to meet?
A. 7 hr
B. 6 hr
C. 9 hr
D. 5 hr
E. 4 hr
Answer: B
Mathematics
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Write the quotient in the form a + bi.
A. 
+ 
i
B. 
- 
i
C. 
+ 
i
D. 
- 
i
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Select the region determined by the constraints. Then find the minimum value of the objective function (if possible) and where it occurs, subject to the indicated constraints. ? Objective function: ? z = 5x + 6y ? Constraints: ? x ? 0 y ? 0 x + y ? 8 3x + 5y ? 30 ?
A. 
No minimum
B.
Minimum at (10, 0): 50
C.
Minimum at (8, 0): 49
D.
Minimum at (5, 3): 43
E.
Minimum at (0, 8): 48
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Find the standard deviation of the probability density function to the nearest hundredth.f(x) = 
; [3, 6]
A. 0.86 B. 0.87 C. 0.94 D. 0.61
Mathematics