Kenji packed an exercise ball into a cylindrical package. The cylindrical package is made out of plastic. In terms of π, how much plastic was used to make the package?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

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You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?