3. The United States population grows at a rate of 0.5% a year. We have around 328.2 million. What will the population be in 50 years? Write the recursive and explicit formula. a. What are the first 3 terms? | b. Recursive: 9₁ = an c. Explicit: 9₁ = f(n) = d. What will the population be in 50 years? Remember, we have to find the 51st term to find the 50th year. f( )=

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The United States population grows at a rate of 0.5% a year. We have around 328.2 million. What will the population be in 50 years? Write the recursive and explicit formula.

 

a. What are the first 3 terms?

b. Recursive:
a1 =

an= 

c. Explicit

a1= 

r=

f(n)= 

d. What will the population be in 50 years? Remember, we have to find the 51* term to find the 50* year.

f(      )= 

 

 

   
    

### Understanding Population Growth Through Sequences

The United States population grows at a rate of 0.5% a year. Currently, the population stands at approximately 328.2 million. This exercise explores how to calculate the population in 50 years using recursive and explicit formulas.

#### a. What are the first 3 terms?

To solve the sequence, identify the initial conditions and the pattern of growth.

#### b. Recursive Formula

Define the initial term and the recursive relationship:

- \( a_1 = \) Initial population
- \( a_n = \) Population in year \( n \)

The recursive formula will typically follow the pattern:
\[ a_n = a_{n-1} \cdot (1 + \text{growth rate}) \]

#### c. Explicit Formula

The explicit formula allows calculation of any term directly without recursion:

- \( a_1 = \) Initial population
- \( r = \text{growth rate} = 0.5\% \text{ or } 0.005 \)

The explicit formula is given by:
\[ f(n) = a_1 \cdot (1 + r)^{n-1} \]

#### d. Calculating Future Population

To find the population after 50 years, recognize that you need the 51st term in the sequence (representing year 50):

\[ f(51) = \text{Calculate using the explicit formula} \]

This exercise helps illustrate how sequences can model population growth over time.
Transcribed Image Text:### Understanding Population Growth Through Sequences The United States population grows at a rate of 0.5% a year. Currently, the population stands at approximately 328.2 million. This exercise explores how to calculate the population in 50 years using recursive and explicit formulas. #### a. What are the first 3 terms? To solve the sequence, identify the initial conditions and the pattern of growth. #### b. Recursive Formula Define the initial term and the recursive relationship: - \( a_1 = \) Initial population - \( a_n = \) Population in year \( n \) The recursive formula will typically follow the pattern: \[ a_n = a_{n-1} \cdot (1 + \text{growth rate}) \] #### c. Explicit Formula The explicit formula allows calculation of any term directly without recursion: - \( a_1 = \) Initial population - \( r = \text{growth rate} = 0.5\% \text{ or } 0.005 \) The explicit formula is given by: \[ f(n) = a_1 \cdot (1 + r)^{n-1} \] #### d. Calculating Future Population To find the population after 50 years, recognize that you need the 51st term in the sequence (representing year 50): \[ f(51) = \text{Calculate using the explicit formula} \] This exercise helps illustrate how sequences can model population growth over time.
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