- Why do bands of minerals develop in most metamorphic rocks?

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Is 13 two thirds of the way from 7 to 16? What is the solution for sqrt(-1), but there are no solutions for 1/0 and 0/0? [Chemistry] Can anyone help me solve this? and show me how.? Can anyone help me how to do this arrival times of poisson processes question? Suppose y varies directly as the square of z and inversely as the square of x. If y=160 when z=32 and x=8, then what is y when z=10 and x=2?