Multiply.4i ? -1i
A. 4i
B. -4i
C. 4
D. -4
Answer: C
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Solve the problem.The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, 
. If 
for a particular person, how long will it take for his alcohol concentration to decrease from 0.10% to 0.05%? Give your answer to the nearest tenth of an hour.
A. 0.2 hr B. 4.6 hr C. 2.3 hr D. 3.5 hr
Determine whether the given geometric series is convergent or divergent, and find the sum if it is convergent.128 - 64 + 32 - 16 + ...
A. Convergent; S = 256 B. Divergent C. Convergent; S = 85.33 D. Convergent; S = 51.2
In a right triangle, find the length of the side not given. Let c represent the length of the hypotenuse. Give an answer to the nearest tenth if necessary.a = 1 ft, c = 30 ft
A. b ? 31 ft B. b ? 30.0 ft C. b = 29 ft D. b ? 5.4 ft
Find the domain of the function.f(x) = 
A. 
, or (-?, -7) ? 
? 
B. 
, or 
? 
C. 
, or 
? 
? (7, ?)
D. {x| x ? 7}, or (-?, 7) ? (7, ?)