Since lucas is never first and garcelle always beats louise it could be garcelle, louise then lucas or garcelle lucas louise 2 options
Answer: 
I suppose 17x^ means 17x².
and that we must solve the equation.
Step-by-step explanation:

12300=X[((1-(1+(0.072/12)^(-12*8))/(0.072/12)]
Solve for x
X=168.92