What is the y-intercept of the function, represented by the table of values below? need

Its D.
First you find the slope which is (picking any points)
y2-y1/x2-x1

0-4/2-1slope is -4

using the 
y = mx+b plug in points
0 = -4(2) + b
0 = -8 +b
b = 8

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.