Men's Shoe Sizes The function Ph(x)3D1.3x-4.7 converts a man's shoe size in the United States to the equivalent shoe size in the Philippines. For instance, a man who wears a US size 12 shoes would wear a Ph shoes of size Ph(12)=1.3(12)-4.7 = 10.9 or 11. A. Determine the Ph shoe size for a man who wears a size 9 US shoe. B. Find Ph-1.Use it to determine the mens US shoe size that corresponds To a Ph shoe size of 5.

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