The pair of triangles are similar. Find the value of the unknown side x . 
Definitions:
Average Variable Cost
The total variable cost divided by the number of units produced.
Long-run Supply Curve
A graphical representation showing the relationship between price and quantity supplied over a period long enough for all inputs to be adjusted.
Short-run Supply Curve
A graphical representation showing the relationship between the price of a good and the quantity of that good that producers are willing to supply in the short run.
Elasticity
A measure of how responsive the demand or supply of a product or service is to changes in price or other factors.
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