Rationalize the denominator. Assume all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Answer: A
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Write the given iterated integral as an iterated integral with the order of integration interchanged.
A. 
B. 
C. 
D. 
Divide, if possible. If a quotient is undefined, state so.
A. -77 B. 0 C. 1 D. Undefined
Solve.Bill took 0.792 minutes longer than Bob to run a marathon. Write this decimal as a fraction.
A. 
B. 
C. 
D. 
Strontium 90, a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is 27 years. If the amount of strontium 90 in a certain area is found to be eight times the "safe" level, find how much time must elapse before an "acceptable level" is reached. ? __________ years
Fill in the blank(s) with the appropriate word(s).