Suppose jamal swam the 100-meter butterfly race in 57.79 seconds. the next time he swam the same race, he swam it in 54.83 seconds. what percent decrease was there in his time? round your answer to the nearest tenth of a percent.
hint
5.1

Sum is 17 and their difference is 3

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?

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.