The half-life of a radioactive substance is 20 years. If you start with some amount of this substance, what fraction will remain in 100 years? What fraction will remain in 180 years?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

If i have one apple and give you the apple, how many apples do i have?

Select the lengths in centimeters that would form a right triangle