adjacent, and complementary
The expression is Undefined for x=0, assuming you intend 1/(-8x).
x=0 is "nonpermissible"
Associative property moves the parenthesis
Choice B
3x + 4 = 2x + 2
3x - 2x = 2 - 4
x = -2
one solution
14gallons=380miles
14/380=<span>0.03684210526gallons/mile
</span>
418*<span>0.03684210526=15.4gallons
</span>
or you could cross multiply
14gallons=380miles
x gallons=418miles

380x=5852
divide both sides by 380
x=15.4 gallons