I NEED HELP ASAP LIKE 911 HELP PLEASE

Bed a is seven feet long. bed b is 7/8 of bed a. bed c is 7/8 of bed b. bed d is 7/8 of c. a. come up with an expression for the length of bed d. b. what is the length of bed d?

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?