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For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint

Find the least common factor denominator for these two rational 7/x^2 and 7/5x