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The function D(h)=7e^-0.4(h) can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours after the drug has been given. How many milligrams will be present after 9 hours. Round three decimal places.

so 7e^(-0.4 x 9) = .191

To get this answer I used a TI-83 calculator. My question is how do I enter this in a TI-30 calculator.? In my math class we are not allowed to use the TI-83.

  • math -

    I know for the simplest TI-30, they have an INV button and for later models they have a 2ND function button, but here is my suggestion

    INV or 2ND

    you should get .191266..

  • math -

    Thank You!

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