Use the graphs in Problem 2 to approximate the times when the amounts x(t) and y(t) are...

Use the graphs in Problem 2 to approximate the times when the amounts x(t) and y(t) are the same, the times when the amounts x(t) and z(t) are the same, and the times when the amounts y(t) and z(t) are the same. Why does the time that is determined when the amounts y(t) and z(t) are the same make intuitive sense?

Reference: Problem 2

In Problem 1 suppose that time is measured in days, that the decay constants are k₁=−0.138629 and k₂=−0.004951, and that x₀ = 20. Use a graphing utility to obtain the graphs of the solutions x(t), y(t), and z(t) on the same set of coordinate axes. Use the graphs to approximate the half-lives of substances X and Y.