Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. None of them
B. Closure, identity, inverse, and commutative only
C. All of them
D. Closure, identity, inverse, and associative only
Answer: C
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Solve. The FDA approves a new drug and has confirmed by independent research that the strength of the reaction to the drug is given by the expression 
where d is the dosage of the drug and ? is a constant. Factor this expression.
A. d2
B. 
(? - d)
C. d2
D. 
Determine whether the system of equations is consistent with independent equations, consistent with dependent equations, or inconsistent.
A. Inconsistent B. Consistent with independent equations C. Consistent with dependent equations
Find the exact value of the expression if ? = 30°. Do not use a calculator.g(?) = cos ?Find g(2?).
A. 
B. 
C. 1
D. 
Identify the conic section represented by the equation.4y2 - x2 - 12x + 6y - - 12 = 0
A. hyperbola B. parabola C. ellipse D. circle