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Should I sleep in the barn with all the cows because cattle rhymes with cuddle? What is the Schwarzschild radius, in kilometers, of a black hole whose mass is 3.06×10^8 MSun? The Ka of a monoprotic weak acid is 6.39 × 10-3. What is the percent ionization of a 0.111 M solution of this acid? The green light in the hydrogen spectrum has a wavelength of 434.1 nm. What is the photon energy of this light? Solve and write interval notation for the solution set. Then Graph the solution set. -1≤x-4<8?