A couple has a 400 acre farm that they want to leave to their future grandchildren. They decide to give each grandchild 12% of the land remaining when the child is born. Let y be the amount of land remaining after x grandchildren are born

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step-by-step explanation:

the answer to this is a. a^2 + b^2 = c^2

d.) 48 units

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.