For the final part of a race, a runner runs 32 feet each second across a distance of 400 feet. The expression represents the x time it take for the runner to travel the last 400 feet of the race is.

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?

How can i differentiate this equation?