Explanation:
To find f(8 months), we can use the formula:
f(n) = 6000 - 120n
Substituting n = 8, we get:
f(8) = 6000 - 120(8) = 5160
Therefore, f(8 months) is 5160.
To find f(22 months), we can again use the formula:
f(22) = 6000 - 120(22) = 3480
Therefore, f(22 months) is 3480.
To find f(4 years), we need to convert 4 years to months and then use the formula:
f(4 years) = f(48) = 6000 - 120(48) = 48
Therefore, f(4 years) is 48.
Answer to Khan's questions:
- Is the input in savings dollars? Yes, the initial account balance is given in dollars.
- Will the account be at $4660 in one year? No, we cannot determine this without additional information about the interest rate or other factors that may affect the account balance.
- Will it take 50 months for the account to hit $0? No, we cannot determine this without additional information about the interest rate or other factors that may affect the account balance.