Perform the indicated operations and express your answer in the form a + bi. 
A. 8i
B. i
C. ±8
D. -8i
Answer: A
Mathematics
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Simplify. Be sure to rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 3
C. 3
D. 
Mathematics
Find the probability.You are dealt two cards successively (without replacement) from a shuffled deck of 52 playing cards. Find the probability that the first card is a king and the second card is a queen.
A. 
B. 
C. 
D. 
Mathematics
Find the unit vector having the same direction as v.v = -4i - 3j
A. u = -20i - 15j
B. u = 
i + 
j
C. u = - 
i - 
j
D. u = - 
i - 
j
Mathematics
Multiply or divide as indicated. Write the answer in lowest terms.
? 
A. 
B. 
C. 
D. 
Mathematics