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16 more than the product of 5 and p

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit