Solve the problem.How many ways can the letters ABCD be arranged?
A. 24
B. 12
C. 4
D. 120
Answer: A
Mathematics
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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. 1.7 hr B. 0.4 hr C. 2.3 hr D. 1.2 hr
Mathematics
Solve the proportion for the item represented by a letter.
?
?
__________
Fill in the blank(s) with the appropriate word(s).
Mathematics
Write a fraction to represent the shaded part of the object.
A. 
B. 
C. 
D. 
Mathematics
Solve the inequality.x2 - 81 ? 0
A. (-?, -9] or [9, ?) B. [-81, 81] C. [-9, 9] D. (-?, -81] or [81, ?)
Mathematics