Factor the trinomial completely. If the polynomial cannot be factored, write "prime."x2 - x - 42
A. (x + 1)(x - 42)
B. prime
C. (x + 7)(x - 6)
D. (x + 6)(x - 7)
Answer: D
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The decibel, a measure of loudness, is related to the relative intensity of sound by the formula
Decibels 
(Relative intensity).
If relative intensity is divided by 1,000, how are decibels affected?
?
A. Decibels are increased by 3. B. Decibels are decreased by 3. C. Decibels are increased by 30. D. Decibels are decreased by 30.
Match the description with the correct graph.An increasing line that is nearly vertical.
A. 
B. 
C. 
D. 
Evaluate -(-x) for the given value of x.x = 170
A. 
B. 170
C. 0
D. -170
Solve the problem.Syed, who is 1.64 m tall, wishes to find the height of a tree with a shadow 35.12 m long. He walks 21.45 m from the base of the tree along the shadow of the tree until his head is in a position where the tip of his shadow exactly overlaps the end of the tree top's shadow. How tall is the tree? Round to the nearest hundredth.
A. 2.69 m B. 2.64 m C. 1.64 m D. 4.21 m