Posted by **Mirayah Robinson** on Friday, August 19, 2005 at 8:02pm.

1.2 (1+ 23.0 x 10-6/Â°C*50) Could someone solve this problem for me and tell me how did you get the answer? I've tried to solve this problem in so many ways, but can't get the right answer. My multiple choices are A.0.001386 meters, B.0.00180 meters, C.1.201386 meters, D.1.214855 meters. Thank You so much!!

The correct answer is C. Just perform the calculations indicated and you get

1.2 x [1 + (2.3*10^-5 * 50)]

= 1.2 x (1.00115)

= 1.20138

Ignore the 7th significant figure in 1.201386; It is not meaningful.

i don't understand math

can someone help me like joseph in my math class

One additional remark. I have noticed that the answers you have been given on a number of questions are wrong...wrong in the sense of precision. It is not possible to get five or six or seven significant figures from a question that the data is only two or three significant figures. In this problem, 1.2 meters is precise to two significant figures, but the answers are given as "choices" are all greater than that. Point this out to your teacher, it is nonsense to try to get more precision than is given.

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