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adajiamcneal
 one year ago
Please explain to me how i got these wrong
adajiamcneal
 one year ago
Please explain to me how i got these wrong

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Whenever you perform these operations while using sig figs, your final answer should have the same number of sig figs as the number with the LEAST number of sig figs. So, let's take the third one for example.\[485.369\div0.124=3914.26612903225806\]Now, let's see how many sig figs we should be using. For 485.369, this number has 6 sig figs. For 0.124, this number has 3 sig figs. So, since 3 < 6, our final answer should have 3 sig figs. Rounding our answer, it will be 3.91E3 (notice how scientific notation makes this nice and neat for sig figs.

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1wait now im even more confused. . .

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Which part has you confused?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0First of all, do you see how 485.369 has 6 sig figs?

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1yeah i get that part. i dont understand what the e is for

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0E is a shortcut for scientific notation. So, \(3.91E3 = 3.91\times10^3\) (Sorry for being ambiguous, I should've made that more clear.)

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1oh ok lol . so let me try another one on my own but dont leave just incase i dont get it pleasee

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1for A being that theres 2 significant figures on both sides does that mean the answer has 2?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Wait, one more thing, I forgot to mention. The rule ^ works for multiplication and division. Addition and subtraction is slightly different. For addition and subtraction, you use the number of decimal places of the LEAST amount of accuracy. So, for example, if we had: \[0.123 + 0.00132 = 0.12432\]However, 0.123 has the least number of decimal places, so your answer will be rounded to 3 decimal places. So, we would get 0.124.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So, for A, after you add them, your answer should have 1 number to the right of the decimal because 1.2 has the least precision.

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1oh ok so would that answer be 1.3 e3?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The 1.3 would be fine. You wouldn't need the e3 because the number isn't bigger than that. The reason I used the e3 before is because my answer to that first example would've been 3910 (compared to the original of 3914.266). 391 are DEFINITELY significant figures, but the 0 is in a bit of a gray area. So, to make sure that it's clear that we mean for 3 sig figs, we use scientific notation and say 3.91 e3. The 3.91 part shows that you meant to have 3 sig figs, and the e3 (or \(10^3\)) makes clear what your actual number is because 3\(3.91 \times 10^3 = 3190\), as we intended.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ignore the 3 before the \(3.91\times 10^3\) at the end.

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1oh ok let me try one more?

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1b would be 0.1 right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Hmm, not quite. You're multiplying here, not adding, so your answer should have the same number of sig figs as the number with the \(least\) sig figs.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So, when adding and subtracting, you deal with decimal places. When multiplying and dividing, you deal with sig figs.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Maybe this will help? http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/sigfigs.html

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1it would be 0.16 ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes! Good job! Just to make sure you had the correct thought process, you got 0.156 in the original, both 1.2 and 0.13 had 2 sig figs, so your final answer will have 2 sig figs. 0.156 rounds to 0.16 when you have 2 sig figs.

adajiamcneal
 one year ago
Best ResponseYou've already chosen the best response.1Ok thank you so much :)
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