Factorial explanation- explain the best way to evaluate 900! /899! without a calculator.

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Scarlett stopped at a campground along the appalachian trail. the campground had a 12 acre area for tents, divided into 6 equal campsites. scarlett picked one of the sections to pitch her tent. which expression would give you the size of scarlett’s campsite? (more than one answer

What is number 31 as a sum of tens and ones?