A rectangle has a length of L and a width, W, that is 4 less than 3 times the length. Which expression would give us the correct perimeter?

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?

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

Hi, can anyone show me how to do this problem? 100 points for this. in advance