just when i thought everything was going perfect i see a girl with him and get told "she's just a friend"

Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.

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

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?