Assuming a trucker changes his tires every for 40,000 miles and that he starts with a brand new set of tires how many sets of tires will be used in a year

The function y= x - 4x+ 5 approximates the height, y, of a bird, and its horizontal distance, x, as it flies from one fence post to another. all distances are in feet. complete the square to find and interpret the extreme value (vertex). select two answers: one extreme value and one interpretation.