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It actually didn't formally instruct me to do so, it apparently expects it any time a larger number is being entered as a general rule that I was not aware of. Learned the hard way! Lol!! :)

OH MY GOODNESS. -400000 is the correct answer, however IT NEEDED TO BE IN SCIENTIFIC NOTATION. Kicking myself in the booty. Thank you all for your help!!:cool:

I forgot, I, too, tried -400,000 on one try! To no avail! Seeing your breakdown, -405000 seems to make the most sense to me of any attempt. However, I tried -405000 just now and it was also incorrect. I'm starting to think the answer key has an issue...:oops: Eek! So frustrating. I like using |...

:confused: So this is driving me crazy. In my Chemistry class, we are learning about retaining significant figures and digits of precision in problems with Mixed Operations. We are told not to round until the end, but to use superscripts to retain significant figures/digits of precision. I have...