Cheese sticks that were previously priced at "5 for $1" are now "2 for $1". find each percent change.

part 1 out of 2
find the percent decrease in the number of cheese sticks you can buy for $1.

the percent decrease is

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?