Which of the following sentences incorrectly hyphenates a compound number?
1 The Antarctic blue whale, at ninety-eight feet in length, is the largest animal on the planet.
2 The longest snake in captivity, a python, was measured at over twenty-five feet in length.
3 The Millau Viaduct in France is the world's tallest bridge at one-thousand-four feet high.
4 The world's longest fingernails were recorded at twenty-four feet and took twenty-eight years to grow.
