Most of the earth's volcanoes occuwhen fossils or minerals form, certain unstable elements are sometimes locked into them. the proportion of these unstable elements gradually decreases over time as they decay into other materials in a predictable way. scientists use the rate at which such unstable elements decay to determine when the fossils or minerals formed. the technique described above is known as as

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?