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PLEASE HELP I DON'T UNDERSTAND THE QUESTION. THANK YOU :)

PLEASE HELP I DON'T UNDERSTAND THE QUESTION. THANK YOU :)-example-1

1 Answer

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ABC and DEC are similar, since the line segments AB and DE are parallel.

This means corresponding sides of these triangles occur in a fixed ratio with one another.

In particular, this tells us

DE/AB = DC/AC

or

7/11 = 15/(15 + x)

Solve for x:

11/7 = (15 + x)/15

11/7 = 1 + x/15

4/7 = x/15

x = 60/7

User Jalanda
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