Chapter 8.5, Problem 28E

(a)

To determine

To explain: why $kr=2e$ and $sv=2e$.

(b)

To determine

To show: that $\frac{1}{s}+\frac{1}{k}=\frac{1}{2}+\frac{1}{e}$.

(c)

To determine

To find: all the integral solutions of the equation in part (b) that satisfy the geometric constraints of the problem. (How small can k and s be?)