Find 
. Express the answer in standard form.z1 = 5(cos 200° + i sin 200°)z2 = 4(cos 50° + i sin 50°)
A. -10 + 10i
B. - 
+ 
i
C. -2 + 2i
D. - 
+ 
i
Answer: B
Mathematics
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Perform the indicated operation. Write the answer in simplest form.
? 
A. 
B. 
C. 
D. 
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Solve the problem.By switching service providers, a family's telephone bill decreased from about $50 a month to about $45. What was the percent of decrease?
A. 5% decrease B. 11.1% decrease C. 10% decrease D. 11% decrease
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Evaluate 
What will be an ideal response?
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