The deck of a bridge is suspended feet above a river. If a pebble falls off the side of the bridge, the height, in feet, of the pebble above the water surface after seconds is given by . Find the average velocity of the pebble for the time period beginning when and lasting

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field