Find the area and circumference of a circle that has a diameter of 17mm. Write your answer in terms of "pi" and as a decimal approximation.

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?

How do i take any fraction and make it into a decimal or percentage?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6