What is the correct integer to represent a withdrawal of 10 dollars?

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?

Opposite angles in a parrellelogram are

The product of 3 and a number increased by 8 is 31 written as an equation