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AlladinOne [14]
4 years ago
11

PLEASE PLEASE HELP!!!

Mathematics
1 answer:
Studentka2010 [4]4 years ago
5 0

Answer:

x = 8

Step-by-step explanation:

small triangle is similar to larger one

set up a proportion:  <u>  9  </u>  =  <u> x + 4 </u>

                                  9+12     x+4+2x

<u> 9 </u>  = <u> x+ 4  </u>                  cross-multiply:  9(3x + 4) = 21(x + 4)

21     3x + 4                                            27x + 36 = 21x + 84

                                                              6x + 36 = 84

                                                               6x = 48

                                                               x = 8

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