Does anyone know the answer?

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 1/3x5 on anuber line what does it look like on a number line

Which expression is the factorization of x^2+10+21