10thnonagonalnumber

<-- Enter nonagonal number statement
  

Calculate nonagonal number 10

The formula for nonagonal number n is as follows
Nn  =  n(7n - 5)
  2

Given n = 10, we have:
N10  =  10(7(10) - 5)
  2

N10  =  10(70 - 5)
  2

N10  =  10(65)
  2

N10  =  650
  2

N10 = 325