Question

@Cosmichaotic
@matricked

Answer 1

domain means you need to check what the independent variable (here x can take)

check the individula intervals given

Answer 2

one interval
is x<=0
then 0<x<5
and x>5

does the last two interval exclude x=5

Answer 3

yes , so it can't be b.

Answer 4

@matricked ?

Answer 5

it should be option B

Answer 6

at x=5 there is break in the domain

Answer 7

oh that's what you meant..
thanks