Use the result of Exercise 59 to find the tenth nonagonal number. (Reference Exercise 5...

Use the result of Exercise 59 to find the tenth nonagonal number.

(Reference Exercise 59)

Observe the formulas given for , and use patterns and inductive reasoning to predict the formula for , the nth nonagonal number. (A nonagon has nine sides.) Then use the fact that the sixth nonagonal number is 111 to further confirm your conjecture.