. The quadratic function d = -4x² + 20 models a skateboarder's distance, in feet, from
the bottom of a hill x seconds after the skateboarder starts moving down the hill. Afte
how many seconds is the skateboarder 6 ft from the bottom of the hill? Put your ansv
in simplified radical form (do not include any decimals in your answer) (Hint: There wi
only be one answer for the question, since one of your answers will not make logical
sense). Show all work!
