Solve the equation.
+ 5 = x
A. {2, 9}
B. {2}
C. {9}
D. {9, 18}
Answer: C
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Perform the indicated operations.-16
+ 2
A. 13
B. 19
C. -14
D. -18
Factor the trigonometric expression.cot2? cos ? - 10 cot ? cos ? + 24 cos ?
A. (cot ? cos ? - 4)(cot ? - 6 cos ?) B. (cos ?)(cot ? - 24)(cot ? - 1) C. (cot ? cos ? + 4)(cot ? - 6 cos ?) D. (cos ?)(cot ? - 4)(cot ? - 6)
Solve.An earthquake was recorded with an intensity which was 
times more powerful than a reference level earthquake, or 
What is the magnitude of this earthquake on the Richter scale (rounded to the nearest tenth)? The magnitude of an earthquake of intensity I is defined as 
, where Io is a minimum level for comparison.
A. 3.9 B. 4.9 C. 0.5 D. 11.3
List the factors of the number.63
A. 1, 3, 5, 7, 9, 11, 21, 63 B. 3, 5, 7, 9, 11, 21, 63 C. 1, 2, 3, 7, 9, 21, 36, 63 D. 1, 3, 7, 9, 21, 63