Classify the following change as physical or chemical: A match lights when struck. A. Physical change B. Chemical change

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Q: Classify the following change as physical or chemical: A match lights when struck. A. Physical change B. Chemical change

A: A match lights when struck. This is a chemical change.

Expert answered|anithasri|Points 40|

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Asked 1/5/2013 12:08:44 AM

Updated 12/17/2015 10:43:00 AM

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This answer has been confirmed as correct and helpful.

Edited by Andrew. [12/17/2015 10:42:59 AM], Confirmed by Andrew. [12/17/2015 10:43:00 AM]

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Solve the quadratic equation. 2x^2 = 32 A. x = ±4 B. x = 2 and x = 32 C. x = 1 and x = 16 D. x = ±2

Weegy: 2x^2 = 32; x^2 = 32/2; x^2 = 16; x = ±4 (More)

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Updated 8/31/2014 6:26:33 PM

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Solve for x: (2x - 4)2 = 1 A. 2, 3 B. 3/2, 5/2 C. 3/2, 3/5 D. 3/2, -5/2

Weegy: The answer is A. 2,3. (More)

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Expert Answered

Updated 8/1/2014 12:40:07 PM

1 Answer/Comment

andrewpallarca

(2x - 4)^2 = 1;
4x^2 - 16x + 16 = 1;
4x^2 - 16x + 16 - 1 = 0;
4x^2 - 16x + 15 = 0;
(2x - 3)(2x - 5) = 0;
2x - 3 = 0; 2x = 3; x = 3/2;
2x - 5 = 0; 2x = 5; x = 5/2;
Solutions: x = 3/2 or x = 5/2

Added 8/1/2014 12:40:04 PM

This answer has been confirmed as correct and helpful.

Factor out the greatest common monomial: 25a6 - 10a5 - 40a4 A. 5(5a6 - 2a5 - 8a4) B. 5a(5a3 - 2a2 - 8a) C. 5a4(5a2 - 2a - 8) D. 5a6(5 - 2a-1 - 8a-2)

Weegy: A (More)

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Expert Answered

Updated 8/31/2014 6:08:09 PM

2 Answers/Comments

janezeshun

Factor out the greatest common monomial: 25a6 - 10a5 - 40a4 is 5a4(5a2 - 2a - 8).
25a6 - 10a5 - 40a4
=5a4(5a2-2a-8).

Added 8/31/2014 6:08:09 PM

This answer has been confirmed as correct and helpful.

Rated good by andrewpallarca, Confirmed by andrewpallarca [8/31/2014 6:21:08 PM]

Factor the polynomial by grouping: x^2 - 2x + 3x - 6 A. (x - 3)(x + 2) B. (x - 2)(x + 3) C. 2(x - 2)(x + 3) D. x2 + x - 6

Weegy: x^2 - 2x + 3x - 6 = (x - 2)(x + 3) (More)

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Updated 6/8/2014 4:34:01 PM

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Simplify: (5x - 10)2 A. 10x2 - 20 B. 25x2 - 100 C. 25x2 - 100x + 20 D. 25x2 - 100x + 100

Weegy: D. 25x2 - 100x + 100 (More)

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Expert Answered

Updated 5/13/2014 8:34:36 AM

1 Answer/Comment

andrewpallarca

(5x - 10)^2;

(5x - 10)(5x - 10);

25x^2 - 50x - 50x + 100

= 25x^2 - 100 + 100

Added 5/13/2014 8:34:36 AM

This answer has been confirmed as correct and helpful.

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