Is 180/20 in simplest form? if not pls tell me

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Use set buikder notation to represent the following set: {, -2, -1, 0}

Arestaurant gives out a scratch-off card to every customer. the probability that a customer will win a prize from a scratch-off card is 25%. design and conduct a simulation using random numbers to find the experimental probability that a customer will need more than 3 cards in order to win a prize. justify the model for your simulation, and conduct at least 10 trials.