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Topic: okay back again  (Read 3737 times)

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anlb4

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okay back again
« on: September 01, 2004, 03:35:12 PM »
now i am stuck again...i feel I should know this stuff..the problem is

243.5-87.1289=1.2/1.753-0.0473-5.4


express the result wityh the crrect number of significant figures..breaking it down I came up with 157.57/-3.69...well I know thts not right...the answer is-4.3x10to the 1 how did they get that  *delete me*!!!!!!!!!!

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Re:okay back again
« Reply #1 on: September 01, 2004, 03:43:29 PM »
Looks right to me.  Evaluate the fraction you have and you should get  something like -42.7.  You're limited to two significant figures,  so it's -43.  Then put it in scientific notation and you get 4.3 x 101.

Some scientific notation links:

http://janus.astro.umd.edu/astro/scinote/
http://www.nyu.edu/pages/mathmol/textbook/scinot.html
http://members.aol.com/profchm/sci_not.html
« Last Edit: September 01, 2004, 03:44:08 PM by movies »

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