Find the indicated probability.The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency table below summarizes the results.
If one of these customers is selected at random, what is the probability that their waiting time is at least 12 minutes or between 8 and 15 minutes?
A. 0.451
B. 0.078
C. 0.65
D. 0.529
Answer: A
Mathematics
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Find the indicated derivative. Assume that x is restricted so that ln is defined.f' 
if f(x) = -ln(cos x)
A. 1
B. - 
C. - 
D. 
Mathematics
Find the gradient field F of the function f.f(x, y, z) = 
A. F = - 
i - 
j - 
k
B. F = 
i + 
j + 
k
C. F = - 
i - 
j - 
k
D. F = 
i + 
j + 
k
Mathematics
Add or subtract as indicated. Simplify the result, if possible.
- 
A. 
B. - 
C. 
D. - 
Mathematics
Solve for base in the problem. Round to the nearest hundredth, if necessary.152 rolls is 49% of rolls.
A. 0.32 B. 3,102 C. 310.2 D. 32
Mathematics