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syed786
Probably a bot.
Joined: 26 Aug 2007
Posts: 1
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 Posted: Sun Aug 26, 2007 4:49 pm Post subject: significant figures |
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evaluate the following expressions and express the answer with the appropriate number of significant figures.
A) 320.55-(6104.5/2.3)
B.)[(285.3 x 10^5)-(1.200 x 10^-3)] x 2.8954
C.) (0.0045 x 20 000.0)+(2813 x 12)
D.) 863 x [1255-(3.45 x 108)]
im not sure if my answers are right, i got: a) -2333.55
b.) 82605762= 8260
c.)33846=3385
d.) 761511.2= 761
PLEASSSSE help me as soon as possible!!!!!!!
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RobJim
Senior Member
Joined: 13 Feb 2005
Posts: 320
Location: Los Angeles, CA
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| Posted: Sun Sep 09, 2007 6:05 am Post subject: |
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A)
320.55 - (6104.5/2.3)
320.55 - 2700
- (2700 - 320.55)
- 2400
Your answer doesn't take into account the SF I believe. SF are confusing though.
B)
[(285.3 x 10^5)-(1.200 x 10^-3)] x 2.8954
(28530000 - 0.001200) x 2.8954
28530000 x 2.8954
2.853 x 10^7 x 2.8954
8.261 x 10^7
2.861
C)
(0.0045 x 20 000.0)+(2813 x 12)
(4.5 x 10^-3 x 2.00000 x 10^4) + (3.4 x 10^4)
9.0 x 10^1 + 3.4 x 10^4
90 + 3400
3490
D)
863 x [1255-(3.45 x 108)]
863 x [1255 - 372]
863 x 883
7.62 x 10^5
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