Perform the indicated operation. Assume that all variables are nonnegative.
? 
A. 15x
B. 15x2
C. 3x
D. 15
Answer: A
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Express in terms of sums and differences of logarithms.log8
A. log819 + 
log8r - log8s
B. log8(19
) - log8s
C. log8s - log819 - 
log8r
D. log819 ? 
log8r ÷ log8s
Solve the system. x + y + z = -2 x - y + 3z = 144x + y + z = -8
A. {(-2, -4, 4)} B. {(4, -4, -2)} C. ? D. {(4, -2, -4)}
Find the midpoint of the segment having the given endpoints.
and 
A. 
B. (196, 4)
C. 
D. (64, 256)
Solve the problem.Some people must eat a low-sodium diet with no more than 2000 mg of sodium per day. By eating 1 cracker, 1 pretzel, and 1 cookie, a person would ingest 149 mg of sodium. If a person ate 8 pretzels and 8 cookies, he or she would ingest 936 mg of sodium. By eating 6 crackers and 7 pretzels, a person would take in 535 mg of sodium. Which of the following statements is true?
A. A cracker contains 30 mg of sodium. B. A cookie contains 71 mg of sodium. C. A pretzel contains 49 mg of sodium. D. A cracker contains more sodium than a cookie.