What is the opposite of the opposite of -1.4?

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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.