Question 1195218
here's my excel spreadsheet.
<img src = "http://theo.x10hosting.com/2022/092203.jpg">
your solution is that the remaining balance just after the 9th payment is equal to  $3,668.73.
you first needed to find the present value of the loan for 600 dollar payment at the end of each semi-annual period for 16 semi-annual periods.
that present value = 7256.47 was the amount of the loan.
the interest rate used was 7% / 2 = 3.5% per semi-annual time period.
here are the results from the calculator at <a href = "" target = "_blank"></a>
<img src = "http://theo.x10hosting.com/2022/092202.jpg">
inputs are everything except pv.
output is pv.
you can see that at the end of the 9th semi-annual time period, the remaining balance was $4,268.73 before the payment was made.
that's your solution.