Write the expression in the standard form a + bi.
A. 1 + i
B. -1 + i
C. -1 - i
D. -1 + 2i
Answer: B
Mathematics
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Determine whether the matrices are inverses. 
, 
A. No B. Yes
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Complete the table.
A. 
B. 
C. 
D. 
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Solve the problem.A deep sea diving bell is being lowered at a constant rate. After 8 minutes, the bell is at a depth of 400 ft. After 45 minutes the bell is at a depth of 1800 ft. What is the average rate of change of depth? Round to one decimal place.
A. 31.1 ft per minute B. 37.8 ft per minute C. 0.03 ft per minute D. 40.0 ft per minute
Mathematics
Solve the problem.Yearly sales of an electronic device S(t), in millions of dollars, t years after 1998 can be estimated by S(t) = 200 ? 2t .Determine the year in which sales reached $1200 million.
A. About 2000 B. About 2002 C. About 2001 D. About 1999
Mathematics