Respuesta :

15/10 = 1.5 scale factor
X= 9
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Answer:

9

Step-by-step explanation:

QR- 2(9-3)=

          2(6)=12

MP- 9+5=14

QRS=MNP

12/8, 15/10, 21/14= 3/1

Scale Factor is 3:1 or 3 to 1