The diameter of a hydrogen atom 0.000000000106 meter. write this diameter in scientific notation

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?

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

I’m really confused and need to learn this