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Mathematics 6 Online
OpenStudy (anonymous):

What is the value of x if necessary round your answer two decimal places

OpenStudy (anonymous):

|dw:1371776258218:dw|

jimthompson5910 (jim_thompson5910):

that's all you're given?

OpenStudy (anonymous):

yes

jimthompson5910 (jim_thompson5910):

that's not enough info, you at least need to know if the triangles are similar or not

OpenStudy (anonymous):

they are similar i know i need to cross multiply but i dont know what order to put them in

jimthompson5910 (jim_thompson5910):

ok wish it said they were similar, but I'll take your word for it

jimthompson5910 (jim_thompson5910):

if the two are similar, then 30/5 = (66-x)/(x+4)

OpenStudy (anonymous):

so then i would get 34x=71-x right?

jimthompson5910 (jim_thompson5910):

no

jimthompson5910 (jim_thompson5910):

30/5 = (66-x)/(x+4) 30(x+4) = 5(66-x) 30x+120 = 330-5x keep going

OpenStudy (anonymous):

i would add 5x on each side

jimthompson5910 (jim_thompson5910):

yep

OpenStudy (anonymous):

and divide 330 with 35 which is 9.4285

jimthompson5910 (jim_thompson5910):

no

jimthompson5910 (jim_thompson5910):

you forgot to subtract 120 from both sides

OpenStudy (anonymous):

oh and then i get 6 after dividing 210 with 35

jimthompson5910 (jim_thompson5910):

6 is the correct answer

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