Explain how you know what number is missing in the equation 3,947 = 3,000 + blank + 40 + 7

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Ineed me i stuck and i don’t want to get it 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