anonymous
  • anonymous
i need the value of x. can someone plz help?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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mathstudent55
  • mathstudent55
Are 21, 36, 12, and x segement lengths?
mathstudent55
  • mathstudent55
Also, are the three horizontal lines parallel?

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More answers

anonymous
  • anonymous
yes and yes
mathstudent55
  • mathstudent55
When parallel lines are cut by transversals, they form segements of proportional lengths.
mathstudent55
  • mathstudent55
|dw:1371134496273:dw|
mathstudent55
  • mathstudent55
The horizontal lines above are parallel. The lengths of the segments are proportional: a/b = c/d = e/f
anonymous
  • anonymous
yes but how exactly do i work out my problem to find (x) cuz thts pretty much my only problem :/
mathstudent55
  • mathstudent55
You set up a proportion between the segment lengths like I showed you with the example I gave. x/12 = 21/36 Now solve the propiortion for x. Start by cross multiplying.
anonymous
  • anonymous
x36= 252 okay this is right? (so far)
anonymous
  • anonymous
7
mathstudent55
  • mathstudent55
36x = 12*21 36x = 252 36x/36 = 252/36 x = 7 You are correct.

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