Help! Determine a so that A(t)=A0a^t describes the amount of radium-223 left after t days, where A0 is the amount at time t=0. Round to six decimal places.

a) 32pie square meters

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.

5 feet of chain cost $9

so the answer is 1.80