River. The largest and most important river in North America, the Mississippi held ... Spanish Intendant Juan Ventura Morales closed the port of New Orleans to ... United States to make Louisiana part of the federal Louisiana Purchase, western half of the Mississippi River basin ... go not only the growing and commercially significant port of New Orleans ... A treaty was signed on May 2 but was antedated to April 30.
Answer:

Explanation:
The formula for apparent brightness is given by the next inequation:

Where B equals apparent brightnes, L equals luminosity and D equals distance.
SO we just have to clear distance from the formula and are left with the inequation to calculate distance:
