A student claims that the function f(x) = 3x^4 – x^3 +7 is a fourth-degree polynomial with end behavior of down and down. Describe the error the student made. What is wrong with this statement?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?