This function Y is called the yield curve, and it is often, but not always, an increasing function of t. Yield curves are used by fixed income analysts, who analyze bonds and related securities, to understand conditions in financial markets and to seek trading opportunities.
Laughing Waters Beach, Ocho Rios, St. Ann, Jamaica (James Bond and Honey Rider meet in the classic scene when Honey walks out of the ocean)
For a fun, full day outing, try a Jamaica Combo Tour: Dunn's River Falls and Bob Marley's Nine Mile. This tour stops by the village of Nine Mile, birthplace of Bob Marley, and then heads over to the Dunn's River Falls, for a guided hike up to the falls and a slide or swim in the natural pools.