What is the rate of change of the tread line that shows how many sit ups Tim completes each minute How many sit ups can tim complete each minute

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.