Due in 5 minutes!! i need help

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

Explain how you can use the associative property to evaluate (7x50)x4.

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?