3+x=8 What would like match this answer

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

Can someone me with the property questions for 12 13 and 14 plz