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g(7) = 3(7) - 7 = 21 - 7 = 14
fog(5) = g(7) = 14
b. (fog)(10) = f{ g(10)} = f(3(10)-7) = f(30-7)= f(23)
fog(10) = f(23) = 23² - 4(23) + 2 = 439
(fog)(10) = 439