What is this simplified: 5(z+4)+5(2-z)

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

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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