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15-06-2020
Mathematics

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What is the length of AC?

What is the length of AC class=

Respuesta :

15-06-2020

Answer:

Step-by-step explanation:

the triangles are proportional

9/81=1/3

140-x/x=1/3

3(140-x)=x

420-3x=x

4x=420

x=420/4 = 105

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