How do you write 103,727,495 in expanded form

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

How do you use the elimination method for this question? explain, because i really want to understand!

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?