On the TI-30x model there is no INV button. You have to use the 10^x function. To do this press the button labeled "2nd" and then the button labeled LOG. Above the LOG button you should see the 10x function which is the same for INV.
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One is the inverse of the other, just like the arc-sine is the inverse of the sine, or division is the inverse of multiplication.
First assuming the log base is '10' ; as per calculaotrs. Then log(10) x = y Then its inverse is x = 10^(y) Hence it follows Inverseof log(10) -0.123 = 10^(-0.123) = 1/10^(0.123) = 1/1.327394458... = 0.753355563.... NB Logs of different bases , like 'e/ln' will give different answers.
b^x In general the log and the exponential are inverses.
An exponential function is of the form y = a^x, where a is a constant. The inverse of this is x = a^y --> y = ln(x)/ln(a), where ln() means the natural log.