Which of the following is true for a principal square root?
None of these statements are true.
There are two principal square roots of any positive number.
The values of principal square roots are always positive.
It is only possible to find the principal square root of a positive number.
Write the principal square root of $16$16.
Do not evaluate it.
Write the negative square root of $49$49.
Do not evaluate it.
Peter said that $\sqrt{441}$√441 is equal to $21$21 because $441$441 is actually $21^2$212, which is $21\times21$21×21, so the square root of this is just $21$21. True or false?