I need 2x+6 but when I solve it it’s wrong

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

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Which inequalities can be used to find the solution set of the following inequality? check all that apply. |2x – 5| (2x – 5) (2x + 5) –(2x – 5) –(2x + 5)