What is the domain of the following relation: Is this relation a function? Why or why not?
R: {(1,2), (-3,5), (1, -2). (2.-3)}?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Which three lengths could be the lengths of the sides of a triangle? 21 cm, 7 cm, 7 cm 9 cm, 15 cm, 22 cm 13 cm, 5 cm, 18 cm 8 cm, 23 cm, 11 cm

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