Whar does7^or other numbers like it mean?

7^0=1

7^1=7

7^2=7*7=49

7^3=7*7*7=343

etc... etc...

That's how people write "raised to the power of" on this website.

7^2 means '7 squared'.

4^6 means '4 raised to the sixth power'.

(a+b+D)^3 means (a+b+D)-cubed.

This website does have a way to write actual exponents, but when you
use them, they're so tiny that you can't read them clearly, and it's easy
to mistake one exponent for a different one.  Just one of the many, many,
.  .  .  .  .  .  .  .  .  .  .  .  .  many,  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  little
problems with this website.