## ChrisV 3 years ago 320.17 - (6101.4/1.8)

1. ChrisV

2. ChrisV

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

3. ChrisV

missing something i guess

4. ChrisV

yes i understand that

5. ChrisV

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

6. ChrisV

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

7. ChrisV

its when i do both im getting confused

8. ChrisV

i assume i do the parenthesis first

9. ChrisV

which comes out to 3389.67

10. ChrisV

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

11. ChrisV

so the first answer is 3400

12. ChrisV

then i take 302.17 - 3400

13. ChrisV

-3097.83 or 3098 in sig fig

14. ChrisV

well its supposed to be 320.17

15. ChrisV

so -3079.83 which would be 3080 in sig fig?

16. ChrisV

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

17. ChrisV

Submitted Answers ANSWER 1: Deduction: -3% 320.17 - (6101.4/1.8) = -3069.50 ANSWER 2: Deduction: -3% 320.17 - (6101.4/1.8) = -3079.83 ANSWER 3: Deduction: -3% 320.17 - (6101.4/1.8) = -3080 ANSWER 4: Deduction: -3% 320.17 - (6101.4/1.8) = -3070

18. ChrisV

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

19. ChrisV

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

20. ChrisV

i swear to you im not trying to get anyone to do my homework, but this is frustrating me and i have two more attempts >.<

21. ChrisV

yes i understand that

22. ChrisV

but here i divide first

23. ChrisV

which gives me two sig figs

24. ChrisV

33.89.67 = 3400 right?

25. ChrisV

3389.67 oops

26. ChrisV

then i take 320.17 and subtract 3400

27. ChrisV

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

28. ChrisV

and that how i got 3080

29. ChrisV

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

30. ChrisV

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

31. ChrisV

but 3400 is ambiguous huh

32. ChrisV

still 2 figs

33. ChrisV

would it be 3100 or -3100?

34. ChrisV

you are my hero, thanks a lot!

35. ChrisV

most certainly did

36. ChrisV

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

37. ChrisV

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

38. ChrisV

my book sucks at explaining! and thanks for the pdf

39. ChrisV

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

40. ChrisV

Just says Chem 121 College of Southern Nevada