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07 Jan 2007, 15:01
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OK, first post but (as all say) I have been reading for a while and it has been a valuable resource. Well, also slightly intimidating, as everyone seems to have committed a lot more prep time to the GMAT than I could manage.
Anyway, I have the test tomorrow, and on the practice test only got one question that I cannot resolve. It was the first one, I got it wrong, and I can't work out the underlying process to get the answer (all the others made fair sense).
Anyway
5^21 * 4^11 = 2 * 10^n
Find n. The answers available don't really matter, I would just really appreciate a full solution so I can see what rules I am missing.
Anyway, I have the test tomorrow, and on the practice test only got one question that I cannot resolve. It was the first one, I got it wrong, and I can't work out the underlying process to get the answer (all the others made fair sense).
Anyway
5^21 * 4^11 = 2 * 10^n
Find n. The answers available don't really matter, I would just really appreciate a full solution so I can see what rules I am missing.
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07 Jan 2007, 15:13
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4^11 = (2^2)^11 = 2^22 = 2 * 2^21
5^21 * 2 * 2^21 = 2 * (5 * 2)^21 = 2 * 10^21
n = 21
peanuts
5^21 * 2 * 2^21 = 2 * (5 * 2)^21 = 2 * 10^21
n = 21
peanuts
07 Jan 2007, 15:34
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Thank you very much. I remember being poor at deconstructing exponentials about 12 years ago as well!
Makes good sense now - I will go back to swotting on my exponential rules.
Makes good sense now - I will go back to swotting on my exponential rules.
