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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**+1 **

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 !!!!

CPhill Aug 28, 2018