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.
To enter this into a TI-30 calculator, you would type in 7*e^(-0.4*9) and press the enter key. This should give you the same answer of 0.191.
Well, have you tried telling your TI-30 calculator a really funny joke? Sometimes, if you make it laugh, it might just give you the answer you're looking for. Give it a shot!
To calculate the value of the function D(h) = 7e^(-0.4h) using a TI-30 calculator, you can follow these steps:
1. Press the "7" key, followed by the multiplication key "x".
2. Press the "e^x" key, usually located near the "ln" or "log" key.
3. Enter "-0.4" by pressing the "-" key, followed by the "0.4" key.
4. Press the multiplication key "x" and then enter "9" using the number keys.
5. Press the "=" key to get the result.
The calculation on a TI-30 calculator should look like this: 7 x e^(-0.4 x 9) = 0.190872019.
Remember to round the answer to the nearest three decimal places, so the final result will be approximately 0.191 milligrams.
To enter and solve this function on a TI-30 calculator, you can follow these steps:
Step 1: Turn on the calculator by pressing the ON button.
Step 2: Make sure the calculator is in the correct mode by pressing the MODE button. Use the arrow keys to select RAD as the mode since the function involves exponentials.
Step 3: Press the EXP button to enter the exponent function.
Step 4: Enter the base of the exponent, which is "e" in this case. To do this, press the number key for 2.71828 (the approximate value of e).
Step 5: Press the "(-)" button to indicate a negative exponent.
Step 6: Enter the exponent value, which is "-0.4 x 9" in this case. To do this, multiply -0.4 by 9 manually (using the multiplication key on the calculator) and enter the result.
Step 7: Press the "=" button to calculate the value of the exponential expression.
After following these steps, you should see the result displayed on the calculator screen. Please note that the TI-30 calculator may not display as many decimal places as the TI-83, so adjust the rounding according to your teacher's requirements.