a) The function is r(t) = 80t
b) Given that the bicycle travels 7.2ft per revolution, the function would be
d(r) = 7.2r
c) This function is as d(r(t))
This means that function r(t) is substituted into function d(r). Thus,
(d o r)(t) = 7.2 * 80t
(d o r)(t) = 576t
The interpretation would be the distance
'The distance covered per minute'
d) (d o r)(30) = 576 * 30 = 17280
The interpretation would be the distance covered
'The distance covered in 30 minutes is 17280 feet'