"the points plotted below are on the graph of a polynomial. in what range of x-values must the polynomial have a root? check all that apply.

a. 2.5 to 3.5
b. 3.5 to 4.5
c. 5.5 to 6.5
d. -2.5 to -1.5
e. -1.5 to -0.5
f. 1.5 to 2.5"

Its very simple.
Just look at the graph and see the points where the graph is intersecting the x-axis.Roots are the points where the graph crosses the x-axis.
Hence,
The graph is apparently crossing the x-axis at 
x = -1
x = 2
x = 6
So,now it easy to define the domain of the function from the given options.

F. 1.5 to 2.5
C. 5.5 to 6.5

I hope it helped.

That. you would have multiple