How can i write 20,484,163 in expanded from

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid