what is 1/2log((x+2)²)+1/3[log(x⁶)-log((x²-x-6)³)] when using 90% reference data?
a. 0.5log((x+2)²) - 0.33[log(x⁶)-log((x²-x-6)³)] + 0.1
b. 0.5log((x+2)²) - 0.33[log(x⁶)-log((x²-x-6)³)] - 0.1
c. 0.5log((x+2)²) - 0.33[log(x⁶)-log((x²-x-6)³)] + 0.2
d. 0.5log((x+2)²) - 0.33[log(x⁶)-log((x²-x-6)³)] - 0.2