Decide whether the given matrix could be a probability vector. 
A. Yes
B. No
Answer: A
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Solve.A company has 63,000 employees. Of these, 
drive alone to work, 
car pool, 
use public transportation, 
cycle, and the remainder use other methods of transportation. How many employees use each method of transportation?
A. Drive alone: 2,100; car pool: 10,500; public transportation: 9,000; cycle: 7,000; 
B. Drive alone: 21,000; car pool: 10,500; public transportation: 9,000; cycle: 7,000; 
C. Drive alone: 21,100; car pool: 10,500; public transportation: 8,900; cycle: 7,000; other: 1000
D. Drive alone: 21,000; car pool: 10,500; public transportation: 9,000; cycle: 7,000; 
Complete the identity.tan4 ? - sec4 ? = ?
A. sec2 ? B. tan 2 ? - sec2 ? C. -2 tan2 ? - 1 D. sec2 ? + tan2 ?
Determine what, if any, value to assign to 
to make f continuous at 
.
?
; 
?
A. 
B. 
C. 
D. 
E. No value of 
will make it continuous at 0.
Express the phrase as a ratio in lowest terms.48 ft to 8 ft
A. 
B. 
C. 
D. 