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Que cambio de estado se produce en la formacion de escarcha en las calles? Thanks in advance. If f(x) is (x^2)+5 when x < 2 and f(x) is 7x-5 when X is greater or equal than 2, then what must be true? Evaluate given sigma notation, how would I go about this? Is it possible to sneeze with your eyes open? Given the following reaction: C3H8+ 5O2= 3CO2+ 4H2O determine the number of moles of carbon dioxide produced?