Why are prices described as a no-cost alternative when allocating scarce resources?

Pythagorean theorem what is the value of x? x = 2 sides are 8 and 10

When belgium gained independence from the netherlands, tensions grew between the walloons and the flemings over a. language b. land c. relations with france d. relations with the netherlands

4. what would be considered a pull factor that would encourage a person to consider migrating to a new country?