Find the indicated probability.The following table show the results of a clinical trial for an allergy drug. 
What is the probability that a randomly selected person received no treatment or improved? Round your answer to the nearest thousandth when necessary.
A. 0.89
B. 0.082
C. 0.742
D. 0.66
Answer: D
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Match the equation with the surface it defines.
+ 
+ 
= 1 
A. Figure 1 B. Figure 2 C. Figure 4 D. Figure 3
Solve the problem.In the study of alternating electric current, capacitive voltage is given by 
, where f is the number of cycles per second, i is the maximum current, and t is the time in seconds. Solve the equation for t.
A. t = 2?f cos 
B. t = 2?f arccos 
C. t = 
arccos 
D. t = 
arccos 
Solve the equation. log(x - 1) 10 = 1
A. {-9} B. {9} C. {11} D. {-11}
Solve the problem.In deciding whether or not to set up a new manufacturing plant, analysts for a popcorn company have decided that a linear function is a reasonable estimation for the total cost C(x) in dollars to produce x bags of microwave popcorn. They estimate the cost to produce 10,000 bags as 
and the cost to produce 15,000 bags as 
. Find the marginal cost of the bags of microwave popcorn to be produced in this plant.
A. $2490.00 B. $0.50 C. $49.80 D. $4.98