Assuming I understand your question:
On an IBM PC keyboard there is a key labeled Ctrl which stands for Control. For a number of functions they will say Press Ctrl plus some other key. For example, Ctrl+C (sometimes written Ctrl-C) copies just like the copy function in the Edit menu.
To copy using Ctrl+C, highlight the area you want to copy, press the Ctrl key and while holding it down, press the C key on the keyboard.
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Use superscript. For example, in MS-Word, select the text you want to raise, and press Ctrl and plus.
There is no step function in Excel. However, you can use excel to create a Step Function Chart. See related links for a video to explain the process.
The function of <Ctrl>D is to indicate "End of Transmission". It is the ASCII EOT code. Some run-time libraries and unix shells can use it when reading from standard input to signal the end of the message.
The easiest way to write powers in Microsoft Word is to use the key combination ctrl+shift++.
83. If your can't use a calculator use your fingers, or just do it in your head!