Factor.x2 - 9
A. (x - 3)2
B. (x - 3)(x + 3)
C. (x + 3)2
D. Not possible
Answer: B
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A. 
B. 
C. 
D. 
Provide an appropriate response.If 9 is substituted for x in the rational expression 
, the result is 
. An often-heard statement is "Any number divided by itself is 1." Does this mean that this expression is equal to 1 for x = 9? Explain why or why not.
What will be an ideal response?
Express the interval in set-builder notation and graph the interval on a number line.[-2, 4)
A. {x 
}
B. {x 
}
C. {x 
}
D. {x 
}
Solve the problem.Suppose that the manufacturing cost of a precision instrument is approximated by 
where x is the cost of materials and y is the cost of labor. Find 
A. 848 B. 288 C. 648 D. 266