7.25 cm plus 7.2 cm plus 8cm equals what

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?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

John checked his watch and said that it is thursday, 7 am. what will the day and time be 2006 hours plzzz i will give you 100 points