Which rational expression is undefined when x = 0? a:5x^2-4/3x-3
b:6x^2/9x-3
c:8x+6/-x^2+1
d:4x-8/-2x^2

450 is the final answer! : )

i will with my problems and all the other things that need to   be on by the way

step-by-step explanation:

large crystals result from very slow cooling.

evaporation of water: this would produce an evaporite which is a sedimentary rock. like a salt pan in a desert. not possible to have volcanic rocks originate this way.

crystalization in molten earth: slow cooling over time. (hundreds to millions of years)

crystalization at earth's surface: this results in fast cooling. (a few hours to a few months or years)

crystalization from cooling off hot water: that would be a hydrothermal deposit. while associated with volcanics they are not volcanic rocks themselves and usually occur fairly rapidly.