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What would happen if all stars in all the galaxy decay at the same rated,would the Universe be full of black holes,is there any purpose? Im stuck will somebody help me? Given F(x)= 5x - 6 and G(x)= x - 4 (G ∘ F)^-1 [inverse of G ∘ F]=? Also, G^-1 ∘ F^-1= ? Relate the Raman effect to optics please? The half-life of the radioactive isotope U-238 is 4.51 x 109 years. What fraction of the sample will remain after 1 billion years `? If a wheel has a diameter of .92m, how far does it travel in 6 rotations?