What are some numbers with a sum of 1

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that