hello.. Could someone please show me how to find the range of these equations. Thanks ~~

Find domain for the following relation:

a) (x + 2)^2 + (y-3)^2 = 49

Find the range of the following functions:

a) m(x) = √(x^2 + 2x +5)

b) (x – 2)^2 + (y+1)^2 = 64

c) h(x) = √(x+4) + √(5-x)

Just some homework qus i m stuck with and cant work out... Thanks for your help :)