Answer:
$668.77
Step-by-step explanation:
Periodic Rate = APR / 12
Periodic Rate = 24% / 12 = 2%
Finance charge = Previous balance × Periodic rate
Finance charge = 549.79 × .02 = 10.9958
(Add charges and finance charge, subtract payments and credits)
New Balance = $549.79 + 10.9958 - $143.30 + 230.18 - 398.05 + 204.94 + 214.21 = $668.7658 ~ $668.77
gnrg
That is asking you to find the sine of (3/4) PI radians.
If you look at the attached graphic, you will see that (3/4) PI radians = 135 degrees
Going to this calculator, we see that the sine of 135 degrees is 0.70711
https://www.1728.org/trigcalc.htm