document.write( "Question 1017829: 1. a)A student says the prime factors of 17 are 1 and 17. Is the student correct?   Explain.
\n" ); document.write( "b) List all the prime numbers between 10 and 20. Explain why they are  prime.  \r
\n" ); document.write( "\n" ); document.write( "2. State the numbers that are neither prime, nor composite. Explain. \r
\n" ); document.write( "\n" ); document.write( "3. Shelby completes one lap of a go­cart track every 40 seconds. Laura  completes one lap of the same track every 30 seconds. Suppose Shelby and Laura  cross the starting line at the same time. 
\n" ); document.write( "How long would it be before the next time they cross the starting line again at the same time? \n" ); document.write( "
Algebra.Com's Answer #634044 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
1. a)A student says the prime factors of 17 are 1 and 17. Is 
\n" ); document.write( "the student correct?   Explain.
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document.write( "No, the only prime factor of 17 is 17 itself.  1 is not a \r\n" );
document.write( "prime number because it has only (exactly) one prime factor, \r\n" );
document.write( "which is 1 itself.  A prime number has exactly two factors. \r\n" );
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\n" ); document.write( "b) List all the prime numbers between 10 and 20. Explain why 
\n" ); document.write( "they are  prime. 
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document.write( "11, 13, 17, 19\r\n" );
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document.write( "11 is prime because it has exactly 2 factors, 1 and 11.\r\n" );
document.write( "13 is prime because it has exactly 2 factors, 1 and 13.\r\n" );
document.write( "17 is prime because it has exactly 2 factors, 1 and 17.\r\n" );
document.write( "19 is prime because it has exactly 2 factors, 1 and 19. \r\n" );
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\n" ); document.write( "2. State the numbers that are neither prime, nor composite. 
\n" ); document.write( "Explain. 
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\r\n" );
document.write( "There is only one such integer, 1.  A prime number must \r\n" );
document.write( "have exactly two factors.  A composite number must have \r\n" );
document.write( "more than two factors. The number 1 does not fit either \r\n" );
document.write( "category because it has exactly one factor, itself.   \r\n" );
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\n" ); document.write( "3. Shelby completes one lap of a go­cart track every 40 seconds.
\n" ); document.write( "Laura completes one lap of the same track every 30 seconds. 
\n" ); document.write( "Suppose Shelby and Laura cross the starting line at the same time. 
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\r\n" );
document.write( "You didn't finish the question.  I will assume it should be \r\n" );
document.write( "something like this:\r\n" );
document.write( "

\n" ); document.write( "When will Shelby and Laura again be at the the starting line
\n" ); document.write( "at the same time, and how often?
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document.write( "They will be at the starting line at the same time when they have\r\n" );
document.write( "each completed a whole number of laps.  That will be at the common\r\n" );
document.write( "multiples of 40 and 30 seconds. The least common multiple of 40\r\n" );
document.write( "and 30 is 120.  So they will be together at the starting every\r\n" );
document.write( "120 seconds or every 2 minutes.\r\n" );
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document.write( "Edwin
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