Question 964630
Please help me with these four question. I work them out,but I think I am doing something wrong.

{{{ sqrt (3.96) }}} = ± 1.989975 
via calculator.
{{{ sqrt (0.32) }}}
{{{ sqrt (0.48) }}}
Use a calculator, or do you have some other question?
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{{{ sqrt(324)}}} + {{{sqrt(729)}}} = 18 + 27 = 45 (principal value)