Can someone me? homework is due tom

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

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

The suare root of 9x plus 7 plus the square rot of 2x equall to 7