Working together, Sophie and Lily solved 53 math problems. Lily solved 19 fewer problems than three times the number Sophie solved. How many problems did each girl solve?

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

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Ihonestly have no clue if it's each or none.