Create a graph of the sequence of triangular numbers (n) = n(n+1) / 2 , where n is a positive integer.

  see below for the graph

Step-by-step explanation:

For this sort of effort, it usually works well to use a spreadsheet or graphing calculator to graph the values in a table. Such a tool can create the table from the given formula.

829 feet per second is your answer. You do this by doing 9,944in/s x ft./12in. Cancel out the in., and multiply to get 9,944ft in 12 seconds. Divide 9,944 by 12 to get around 828.6 ft., and then then round it up to get 829 ft. per second.