It means that a + n + mc + cg = 0
Ctrl+r
Assuming you mean n2 + 11n + 30, the factors are (n + 6)(n + 5).
superscript
Magnify the information displayed on the screen.
Ctrl plus N opens a new window in a browser.
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In Microsoft Word, Ctrl+E allows you to center.
Underline
See the link below for a possible answer.
ctrl an plus zoom the screen in an ctrl minus dezooms it
[CTRL]+C is achieved by holding CTRL while pressing C.
Ctrl + U will underline text that is selected. Ctrl and the plus sign will superscript text. You need to hold the shift key while doing that, otherwise it subscripts the text.
ctrl shift - reverses the effect of ctrl shift =
ctrl plus r reloads a webpage.
The keyboard shortcut notation ctrl plus esc means you press the Control key concurrently with the Escape key. On a Windows PC, the Ctrl + Esc shortcut produces the Start Menu.
Ctrl + 1