Multiply the expressions.(r - 10)2
A. 100r2 - 20r + 100
B. r2 + 100
C. r2 - 20r + 100
D. r + 100
Answer: C
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The decibel, a measure of loudness, is related to the relative intensity of sound by the formula
Decibels 
Relative intensity).
If relative intensity is multiplied by 104.71, how are decibels affected?
?
A. Decibels are increased by 20.2. B. Decibels are decreased by 2.02. C. Decibels are increased by 2.02. D. Decibels are decreased by 20.2.
Provide an appropriate response.Find the magnitude and direction of the resultant of the sum of 1 + 4i and 2 + 5i which are in complex notation.
A. 9.49 with direction of 18.4° B. 8.49 with direction of 71.6° C. 9.49 with direction of 71.6° D. 8.49 with direction of 18.4°
Solve the application problem. Round to the nearest cent.
Gretta wants to retire in 13 years. At that time she wants to be able to withdraw $12,500 at the end of each 6 months for 9 years. Assume that money can be deposited at 5% per year compounded semiannually. What exact amount will Gretta need in 13 years?
A. $179,417.00 B. $820,583.00 C. $187,236.12 D. $171,402.50
Perform the indicated operation. Write the result in the form a + bi.
A. 
+ 
i
B. 
- 
i
C. 
+ 
i
D. 
+ 
i