284.17*x^-0.934=280
x^-0.934=280/284.17=0.985325685
log(x^-0.934)=log(0.985325685)
-0.934*log(x)=log(0.985......)
log(x)=log(0.985325685) /(-0.934)
=(-6.420195936e-3) /(-0.934)
=+6.873871607e-3
invers log is 10 raesed tu power, so x=10^0.006873871607
x=1.015953594
probablee oenlee 1.016