Find the sum of these polynomials. (x9 - x + 8) + (10x9 + 7) = a. 10x18 - x + 15 b. 10x9 - x + 15 c. 11x9 - x + 15 d. 11x18 - x + 15

2 apples

step-by-step explanation:

taking away equals subtraction. 6-4=2

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.