Final answer:
Using the compound interest formula A = P (1 + r/n)^(nt) with the given values, we determine that Ariana would have approximately $580 in her account after 11 years, rounded to the nearest ten dollars.
Step-by-step explanation:
The question involves calculating the future value of an investment with compound interest. To find out how much money would be in the account after 11 years when $400 is invested at an interest rate of 3.8% compounded monthly, we use the compound interest formula:
A = P (1 + r/n)^(nt)
Where:
Substituting the given values:
A = 400(1 + 0.038/12)^(12*11)
Now we calculate the value of A:
A ≈ $584.67
Therefore, rounded to the nearest ten dollars, Ariana would have approximately $580 in her account after 11 years.