Question

PLEASE HELP!!
A monument is built out of toothpicks. There are 25 rows and each row has eight more toothpicks than the row above. The top row has five toothpicks.

Part 1: How many toothpicks are on the bottom row? (4 points)

Part 2: Using complete sentences, explain the procedure taken to answer this question. (4 points)

Answer 1

its an AP.. 5,13,21,29....
you need to find the 25th term of this
use this :- nth term = a+(n-1)d
a= first term,,d= common difference

Answer 2

so 7 should go in for n right?

Answer 3

n=25.. why 7?