A projectile is fired horizontally at 200 meters per second from a rooftop that is 50 meters above ground. What is the vertical change in height?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

What is the value of x? enter your answer in the box.

What is 140 squared pleas me i am dumb