THIS IS FOR TODAY PLEASE HELP!!

1. how do you find p(a and b) if a and b are dependent events for two or more actions, such as selecting two candies and drawing p(green, and then pink)?

Ahealth-food producer has 250 samples of a new snack to distribute in the mall. the producer has to keep at least 50 samples for display in the health food for the product launch. how long will the samples last if consumers are taking the samples at a rate of 25 every hour

X+ 4y − z = −14 5x + 6y + 3z = 4 −2x + 7y + 2z = −17