Factor.xy + y + 9x + 9
A. (x + 9)(y + 1)
B. (x + 1)(9y + 9)
C. (9x + 9)(y + 1)
D. (x + 1)(y + 9)
Answer: D
Mathematics
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Give three kinds of notation for the percent.220%
A. 
; 220 × 
; 220 × 0.01
B. 
; 220 × 
; 220 × 0.1
C. 
; 22 × 
; 22 × 0.01
D. 
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- cot2x cos 
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