A culture of bacteria has an initial population of 1600 bacteria and doubles every 2 hours. Using the formula P(t)=P(0)•2^t/d, where P(t) is the population after t hours, P(0) is the initial population, t is the time in hours and d is the doubling time, what is the population of bacteria in the culture after 19 hours, to the nearest whole number?

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.