A golfer launches a tee shot down a horizontal fairway and it follows a path given by Bold r (t )equals left angle at comma (85 minus 0.1 a )t comma negative 5 t squared plus 60 t right angler(t)=〈at, (85−0.1a)t,−5t2+60t〉, where tgreater than or equals≥0 measures time in seconds and r has units of feet. The y-axis points straight down the fairway and the z-axis points vertically upward. The parameter a is the slice factor that determines how much the shot deviates from a straight path down the fairway.