21-6+3-6= ? What does it equal

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.

For what values of x is x2 + 2x = 24 true?

Can someone me out here number 4 plz