Use the multiplication property of equality to solve the equation. 
= 21
A. -21
B. 21
C. -20
D. 20
Answer: A
Mathematics
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Find the product.-13 ? 
A. 
B. -39
C. - 
D. -8
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Solve the equation.8 = z + 2
A. {-10} B. {10} C. {6} D. {-6}
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Express the product as a sum containing only sines or cosines.cos(5?) cos(9?)
A. 
[cos(14?) - cos(4?)]
B. cos2(29?2)
C. 
[cos(4?) + cos(14?)]
D. 
[cos(14?) - sin(4?)]
Mathematics
Solve the equation.b + 9 = 19
A. 28 B. 10 C. 171 D. 9
Mathematics