Add.-21 + 6

A. 15
B. 27
C. -27
D. -15

Answer: D

Mathematics

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Construct a truth table for the statement. Then determine if the statement is a tautology.~(~p ? q) ? (p ? ~ q)

A.
 
Is not a tautology.

B.
 
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C.
 
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D.
 
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Simplify. ? 

A. 21
B. 21
C. 18
D. 42

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Simplify the algebraic expression by combining like terms.-7y + (-5y)

A. -2y B. -12y C. -12y2 D. 12y

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