How to convert -1.185294e^-4

SOURCE: Default decimal settings

Your BA II PLUS stores numeric values internally to an accuracy of 13 digits. However, the numbers it displays depends on the number of decimal places to which you have it set (choice of 0–9 or floating decimal). To set the number of decimal places displayed to three: hit [2ND][FORMAT][3][ENTER]This setting also continues indefinitely (even though the calculator is turned off and on) until it is changed.

SOURCE: need to program to fifth decimal place

Your BA II PLUS stores numeric values internally to an accuracy of 13 digits. However, the numbers it displays depends on the number of decimal places to which you have it set (choice of 0–9 or floating decimal). To set the number of decimal places displayed to three: hit [2ND][FORMAT][5][ENTER]This setting also continues indefinitely (even though the calculator is turned off and on) until it is changed.

SOURCE: Why can't I change the number of decimal places on

Hello,
It seems to me that you are omitting a step: see screen capture from manual (step 4). Hope it helps.

SOURCE: MY TI nspire always rounds

Turn it on, hit MODE then change the FLOAT value from 1 to Float itself. Float allows you to round, and something changed that setting

SOURCE: My Ti-nspire is set to Float. However, on the box

Float on the t-nspire essentially means round to the nearest whole number. Your best bet is to set float to a higher number.