Use the image to answer the question.

An illustration shows a square with four stars along the edges, two squares attached with six stars along the outer edges; and three squares attached with eight stars along the outer edges.

The tables for a party are seated as 4 people at 1 table, 6 people at 2 tables, and 8 people at 3 tables. Use a sequence to determine how many tables would be needed for 16 people.

1 answer

From the description, we can see a pattern in the number of people seated at the tables:

  • 1 table seats 4 people
  • 2 tables seat 6 people (3 people per table)
  • 3 tables seat 8 people (2.67 people per table)

To analyze the pattern mathematically:

  1. 1 Table: 4 people \( \rightarrow 1 \text{ table} \)
  2. 2 Tables: 6 people \( \rightarrow 3 \text{ people per table} \)
  3. 3 Tables: 8 people \( \rightarrow \frac{8}{3} \approx 2.67 \text{ people per table} \)

This suggests a series with the following pattern:

  • For the first table, there are 4 people - this seems to be a fixed amount.
  • For every additional table, it seems the number of seats increases.

Let's express \( n \) as the number of tables:

  • For 1 table: \( 4 \times 1 = 4 \)
  • For 2 tables: \( 3 \times 2 = 6 \)
  • For 3 tables: \( 2.67 \times 3 \approx 8 \)

If we denote the total number of people as \( P \):

  • When we generalize the number of people with the increment established in the progression, we can find a formula \( P(n) \).

Continuing this pattern, we can project forward:

  • If we set up the equation based on the last known quantities:
    • For \( n = 4 \): It should seat \( 4 + 2 = 10 \)
    • For \( n = 5 \): It should seat \( 4 + 3 = 12 \)
    • For \( n = 6 \): It should seat \( 4 + 4 = 14 \)
    • For \( n = 7 \): It should seat \( 4 + 5 = 16 \)

Thus for 16 people, we find that 7 tables would be needed.