Can someone help with this asap please?

So first of all on the graphs the top right and middle right is the positives, bottom left and middle left is the negatives.

Row 1 is negative
Row 2 is undefined
Row 3 is undefined
And Row 4 is positive.

Hope it helped!

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.