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1991 AMC 12 Question 24

AMC12 · 1991 AMC 12

Question 24

The graph, $G,$ of $y=\log_{10}x$ is rotated $90^\circ$ counter-clockwise about the origin to obtain a new graph $G'.$ Which of the following is an equation for $G'?$
  1. $y=\log_{10}\left(\frac{x+90}{9}\right)$
  2. $y=\log_x10$
  3. $y=\frac1{x+1}$
  4. $y=10^{-x}$
  5. $y=10^x$