We can use the compound interest formula:
The principal value, P, is the initial amount of money: $4129.
The rate of interest, r, is 6.45%, or .0645.
The number of times compounded, n, per year is 1.
The number of years, t, is 7.
Plug all of these values into the equation and solve for A.
Evaluate the expression...
Rounded to the nearest dollar, this value becomes: $6395.
The investment will be worth $6395 after 7 years.