If 8 out of 10 dentists approve a certain brand of toothpaste, what is the ratio of dentist who approve the toothpaste to those who do not, given in simplified form?

What's the difference between: x≥0 and nonnegative integer. ?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?