Solve the problem.The half-life of plutonium-234 is 9 hours. If 20 milligrams is present now, how much will be present in 2 days? (Round your answer to three decimal places.)
A. 13.819
B. 0.496
C. 17.145
D. 4.286
Answer: B
Mathematics
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Simplify.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Find the value for x in the following special right triangle. Use exact values. 
3 m
A. 6
m
B. 
m
C. 6 m
D. 3
m
Mathematics
Write a variable expression to describe the situation.The ratio of brick houses to wooden houses in a particular city is 5 to 11. Let b = the number of brick houses and w = the number of wooden houses.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
Solve the problem.Consider the following 1 × 1, 2 × 2, and 3 × 3 matchstick designs.
How many matchsticks are needed for a 12 × 12 design?
A. 288 B. 148 C. 156 D. 312
Mathematics