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Classify the following change as physical or chemical: A match lights when struck. A. Physical change B. Chemical change
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 252 days ago|12/17/2015 10:43:00 AM
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This conversation has been confirmed as correct, not copied, 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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Questions asked by the same visitor
Which of the following points is on the graph of the equation y = x2 ? A. (-2, 4) B. (-5, 10) C. (5, 10) D. (4, 8)
Weegy: best answer is A. (-2, 4) (More)
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Expert Answered
Asked 12/31/2012 10:47:41 AM
0 Answers/Comments
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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Expert Answered
Updated 8/31/2014 6:26:33 PM
0 Answers/Comments
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)
Question
Expert Answered
Updated 8/1/2014 12:40:07 PM
1 Answer/Comment
(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, not copied, and helpful.
What is the range of y = -3x2 + 2? A. y = -3 B. y = 2 C. y = 2 D. y: all real numbers
Weegy: Solution : (4x^2 ? 2x + 3) ? ( -3x^2 + 2x ? 5) 4x^2 ? 2x + 3 + 3x^2 - 2x + 5 = 7x^2 - 4x + 8 (answer) User: What is the range of y = -3x2 + 2? A. y = -3 B. y = 2 C. y = 2 D. y: all real numbers (More)
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Expert Answered
Updated 8/15/2014 2:41:47 AM
1 Answer/Comment
y=2 is the range of y = -3x2 + 2.
When x=0,the value of y the lagest. y=-3*0+2, y=2.
Added 8/15/2014 2:41:47 AM
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