30 POINTS iF you ANSEWR THIS

The error is that he was supposed to do the equation 2^2 which equals 4. 17-4= 13. 13 is your answer, not 225

Step-by-step explanation:

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

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.