Could someone remind me how to calculate this on the TI-84 Calculator:

Which buttons do I hit for this:
3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21

It should come out to be 5.55 *10^-7 but I'm not doing the input correct
Please help

To correctly input and calculate the expression 3 * 10^8 / 5.4 * 10^14 on a TI-84 calculator, follow these steps:

1. Turn on the calculator and press the [On] button if necessary.
2. Input the first part of the expression, 3 * 10^8, by pressing the following buttons in order:
- Press the [3] button.
- Press the [x^y] button (located above the [7] button).
- Enter '8' using the number pad.
- Press [ENTER] to complete the first part of the calculation.
3. Next, input the division symbol (/) by pressing the [÷] button (located above the [8] button).
4. Enter the second part of the expression, 5.4 * 10^14, by pressing the following buttons:
- Press the [5] button.
- Press the [.] button for the decimal point.
- Enter '4' using the number pad.
- Press the [x^y] button.
- Enter '14' using the number pad.
- Press [ENTER] to complete this part of the calculation.
5. The calculator will perform the division and provide the answer in scientific notation. In your case, it should display as 5.55E-7.

It seems there was an error when you entered the equation, resulting in an incorrect output. By following the steps mentioned above, you should be able to obtain the correct answer of 5.55 * 10^-7.