It would be 7.
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16 = 7f + 2 14 = 7f 2 = f
F = 9/5 C + 32 = (9/5) x 10 + 32 = 18 + 32 = 50
F = 41.5 9/5 + 32 is the conversion factor from Celsius to Fahrenheit.
Let, f (x) = - 5x - 9 Therefore, f(x) + 7 = - 5x - 9 + 7 f(x) + 7 = - 5x - 2
wth??