how many oranges for the 10th Layer?

Question

if you pile oranges in a pyramid that has 1 orange in the top layer 4 in the next layer 9 in the third layer and 16 in the fourth layer. How many oranges will you need to make a pile with 10 layers?

Answer 1

sequens=1, 4, 9, 16, 25...

delta=3, 5, 7, 9, 11, 13...

term n=n^2

term 10=10^2=100