[问答题]
The radius of a cylindrical contaiw w1sry1zi+ j(s6 puj ,)ykti/ner with height x cmh-kxt/p4h . nagn6:eo is
r(x)=$\frac{56}{x}$,4≤x≤161.Find the range of r.
The function $r^{−1}$ is the inverse function of r.
2.(1)Find $r^{−1}(8).
(2)Interpret the answer to part (b) (i) in context.
(3)Find the range of $r^{−1}$.