The sign only changes when divided or multiplied by a negative number.
(C,D) is 5 units
(E,F) is 4 units
(A,B) is 6units
(G,H) is 3 units
Hmm
remember

can translate to

so

can translate to

divide both sides by 3


use calculator, if you can't use change of base formula to do it

so

evaluate using base 10 on your calculator
0.560869=x