(30 points)Red Rocks Parks is an open air amphitheater carved out of rock, near Denver Colorado. The amphitheater has 69 rows of seats for 3318 people. The number of seates in the first 45 rows can be modeled by the arithmetic sequence whose nth term is 871/2 + 3/2 * n .
You are organizing a concert at Red Rocks Parks. Using sigma notation, find the sum of the first 45 rows. The sum is ________ How much should you charge per ticket in order to receive $50,000 for the ticket sales of a performance that is sold out? ________ per ticket (round answer to nearest tenth digit)