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by mschling52 » Mon Jun 04, 2007 9:45 am
I think it is E - 14. If you break 3150 into it's prime factors, you get

3150 = 2*3*3*5*5*7 = (3^2) * (5^2) * 2 * 7 = (15^2)*2*7

For 3150 to be expressed as a square of an integer, the 2 and 7 in the prime factorization need to be multiplied by another 2 and another 7, which would give us

3150 * y = 3150*14 = (3^2)*(5^2)*(2^2)*(7^2) = 210^2,

so y=14.
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by zozo123 » Mon Jun 04, 2007 12:46 pm
The answer is E!! It's right.


Thank you for yours explanations (good strategy to solve it)
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