What is the answer to this equation?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Driving 75 mph, it takes alicia 2 hours to reach the airport to go on a vacation. it then takes her 4 hours to get to her destination with the jet traveling at a speed of 400 mph. how many miles does alicia travel to get to her destination?

When solving a logarithm equation, how do you find the missing variable ?