What is 2,305,684 in scientific notation

For the equations below which statement is true ?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%