What is 2/4 +(-8/4) i'm a little stuck

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.

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Alogical argument that is presented in graphical form using boxes and arrows is called?