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

Mathematics

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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.

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Match the description with the correct graph.An increasing line that is nearly vertical.

A.

B.

C.

D.

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Evaluate -(-x) for the given value of x.x = 170

A.
B. 170
C. 0
D. -170

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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

Mathematics