Simplify.
A. 
B. 1
C. 1 - a2
D. 
Answer: D
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Use De Morgan's law to write the negation for the statement.She is not older than 20 and he is older than 20.
A. She is older than 20 but he is not older than 20. B. It is not true that she is older than 20 or he is not older than 20. C. She is older than 20 or he is not older than 20. D. She is older than 20 or he is not younger than 20.
Write an equation so that y depends on x. Find the amount of tax, y, for an 8.7% sales tax on a purchase x.
A) y = 0.087x B) y = 0.87x C) x = 0.87y D) x = 8.7y E) y = 8.7x
Subtract.(12x + 25xy - 9y) - (18x - 21xy - 16y)
A. -13x + 6xy + 25 B. 47xy C. -6x - 46xy - 25y D. -6x + 46xy + 7y
Tell whether the relation is a function.{(-6, 8), (-3, 3), (-1, -8), (3, -7)}
A. Function B. Not a function