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Answer in proper significant figures.

ive tried to answer this four times and missed it all 4 times

missing something i guess

yes i understand that

i know when i multiply I take the smallest amount of sig fig

and when i add or subtract i take the number of least certainty in common

its when i do both im getting confused

i assume i do the parenthesis first

which comes out to 3389.67

do i round that to two sig figs or subtract first?

so the first answer is 3400

then i take 302.17 - 3400

-3097.83 or 3098 in sig fig

well its supposed to be 320.17

so -3079.83 which would be 3080 in sig fig?

which i tried that answer and it marked me wrong >.<

yes but when you subtract dont you take the last significant decimal place to them both?

could you show me how you would solve this so i may understand?

yes i understand that

but here i divide first

which gives me two sig figs

33.89.67 = 3400 right?

3389.67 oops

then i take 320.17 and subtract 3400

since 3400 has no decimal spots i round to the nearest 1 spot

and that how i got 3080

oh so the two sig figs i get when dividing applies still after i subtract?

for some reason i thought when i rounded to 3400 i was done with the division part

but 3400 is ambiguous huh

still 2 figs

would it be 3100 or -3100?

you are my hero, thanks a lot!

most certainly did

now i have to do the other three parts of the question but at least I understand a little more

well i understand mult/div and add/subt.... a little confused when they use both together

my book sucks at explaining! and thanks for the pdf

well its a custom made book for my college made by pearson

Just says Chem 121 College of Southern Nevada

first solve the bracket and then do subtraction and finnaly the rules of significant.