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Jocelyn needs to study two stars for her astronomy research. She has narrowed her choices down to four stars that are located on a straight line from earth

 

 

https://snag.gy/u3wlfF.jpg

 

Jocelyn wants to study the two stars that are closest to each other

 

 

Is it B and D?

Guest Aug 28, 2018
 #1
avatar+91027 
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One way of doing this is to get the powers of 10 the same...the answer is usually easier to  see then

 

.176 x 10 ^18  =    1760 x 10^14   = A

22.13 x 10^16  =   2213 x 10^14   = B 

31.42 x 10^14 =    31.42  x 10^14  = C

125.5 x 10^15  =  1255 x 10^14     = D

 

Note that C isn't close to  anything...so we can eliminate that choice

 

Distance from A to B  =   [2213 - 1760 ] x 10 ^14  =  453 x 10^14

Distance  from  A to D  =  [ 1760 - 1255 ] =  505 x 10^14

Distance from  B to D  =  [2213  - 1255] x 10 ^14   = 958 x 10^14

 

Note that A and B  are the closest  !!!!

 

 

 

cool cool cool

CPhill  Aug 28, 2018

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