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The number of cars sold weekly by a new automobile dealership grows according to a linear growth model.

- The first week the dealership sold six cars ([tex]P_0 = 6[/tex]).
- The second week the dealership sold nine cars ([tex]P_1 = 9[/tex]).

1. Write the recursive formula for the number of cars sold, [tex]P_n[/tex], in the (n + 1)th week.
- [tex]P_{n} = P_{n-1} + \_\_\_[/tex]

2. Write the explicit formula for the number of cars sold, [tex]P_n[/tex], in the (n + 1)th week.
- [tex]P_{n} = \_\_\_[/tex]

3. If this trend continues, how many cars will be sold in the fourth week?
- [tex]\_\_\_\_ \text{ cars}[/tex]

Answer :

The recursive formula of the function is P(n + 1) = 3 + Pn while the explicit formula is P(n) = 6 + 3(n -1)

The recursive formula of the function

The given parameters are

Po = 6

P1 = 9

From the question, we understand that the number of cars follows a linear model

This means that the common difference is

d = P1 - Po

So, we have

d = 9 - 6

Evaluate

d = 3

The recursive formula is

P(n + 1) = d + Pn

So, we have

P(n + 1) = 3 + Pn

The explicit formula of the function

From the question, we understand that the number of cars follows a linear model

This means that the common difference is

d = 9 - 6

Evaluate

d = 3

The explicit formula is

P(n) = Po + (n -1) * d

So, we have

P(n) = 6 + (n -1) * 3

Evaluate

P(n) = 6 + 3(n -1)

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