How many lines of symmetry does a decagon
a.0
b.5
c.10
d.20

in the fourth graph y=2.5

step-by-step explanation:

we have been the equation   2y=5

which implies   y=5/2=2.5

now, we have to see in which graph we are getting the value of y as 2.5

in fourth graph we are getting the value y=2.5

you can see the graph in attachment.

in rest of the graphs we are not getting the required value. which is y=2.5.