Malachy was thinking of a number. Malachy divides by 2, then adds 9 to get an answer of 4. What was the original number?

What 2 forces allow things to fall ‍♀️‍♀️

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Add the fractions and simplify 1/2+ 1/3