[Hayseed (OP)]

There is a key between the C clear all function key and the divide symbol function key.

It has an x inside a left pointing box.

What is that key called, and what does it do?

[syhprum]

It enables you to selectively edit your input if you have entered 1234 hitting this will reduce it to 123, no idea what it is called.

[Hayseed (OP)]

Backspace.  Thank you very kindly.

[syhprum]

I gunned up the scientific version and asked it to evaluate the cube root of minus 27 a test I apply to all calculators but it failed miserably "bleep bleep as my tech school maths math master said you cant get the roots of negative numbers.
I  always use Mathematica when I want an authoritive  answer   

[Bored chemist]

I gunned up the scientific version and asked it to evaluate the cube root of minus 27 a test I apply to all calculators but it failed miserably "bleep bleep as my tech school maths math master said you cant get the roots of negative numbers.
I  always use Mathematica when I want an authoritive  answer   

Get real.