Perform the indicated operation and write the answer in the form 
where a and b are real numbers.(
- 9i)(
+ 9i)
A. 3 - 81i
B. 12
C. 84
D. 3 + 81i
Answer: C
Mathematics
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Solve the equation.x - 128 - 8
= 0
A. {192} B. {512} C. {128} D. {256}
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Simplify the complex fraction.
A. 
B. 
C. 
D. 
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Find the indicated probability. On a multiple choice test, each question has 6 possible answers. If you make a random guess on the first question, what is the probability that you are correct?
A. 1
B. 
C. 0
D. 6
Mathematics
Add.(r + 5s + 1) + (-5r + s) + (s - 5)
A. -6r + 7s - 4 B. -5r + 5s - 4 C. -4r + 7s - 4 D. -4r + 6s - 4
Mathematics