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7-35.

Ryan has the chickenpox! He was told that the number of pockmarks on his body would grow exponentially until his body overcomes the illness. He counted pockmarks on November 1 and by November 3 the number had grown to . To determine when the first pockmark appeared, he needs to write the exponential function that models the number of pockmarks based on the date in November. Homework Help ✎

  1. Ryan decides to use the points and to write an equation for the exponential model. Use these points to write the equation of his function in the form .

    Substitute both points into the equation and solve for and .

  2. According to your model, on what day did Ryan get his first chickenpox pockmark?

    Solve for 

    , so October 22