Answer:
square root of 45 is 6.71 when rounded up,
Explanation:
square root of 45 is 6.7082093 we round up (numbers 5&up round up 4 and below go down) so we get 6.71
square root of 23 is 4.79583152 we round to 4.8
square root of -23 is 4.79583152 i . Yes,the i is part of the number.
Generally i means imaginary. also technically if this is for school they might accept this result as a negative number.
Hope this helps.