Age 30 or Under OverTotal Yes 125 300 425 Uses Mass-Transit System Regularly No 450 225 675 Total 575 525 100 Find Pluses mass transit|age is 30 or under) ​

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.