domain is the x values that we can use
range is the y values we can use
remember, open circle is like < and > but filled in circle is ≤ and ≥
x is left right
y is up down
so
68.
a. we see we have x=-2, x=-1, x=2
and
y=0, y=1, y=-1
domain is D={-2,-1,2}
range is R={-1,0,1}
b.
x goes from -1 to 1, not including -1
range is from 2 to -1, not including 2
domain is D={x|-1<x≤1}
range is R={y|-1≤y<2}
c. domain is from x=-1 to x=infinity, not including -1
range is from -1 to infinty, not including -1
domain is D={x|x>-1}
range is R={y|y>-1}
d. domain and range is all real numbers
