Mathematics, 13.10.2020 21:01 dbih2014

If f(x) and r1(x) are inverse functions of each other and f(x)=2x+5 , what is f^-1(8) ? PLEASE HELP!!

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If f(x) and r1(x) are inverse functions of each other and f(x)=2x+5 , what is f^-1(8) ? PLEASE HELP...