Which of the following sets would have a graph that is a closed circle on -4 and an arrow to the left? {x | x E R, x -4} {x | x E R, x ≥ -4}

Question

Which of the following sets would have a graph that is a closed circle on -4 and an arrow to the left?


{x | x E R, x < -4}
{x | x E R, x ≤ -4}
{x | x E R, x > -4}
{x | x E R, x ≥ -4}

anonymous · Answer

A??

debbieg · Answer

Do you know what the closed circle on the graph means? (vs an open circle)?

anonymous · Answer

greater than or equal to is closed rite?

debbieg · Answer

Right. the endpoint is included in the set.

anonymous · Answer

so its either b or d rite

debbieg · Answer

So > or = means closed, strictly > means open (that marks the endpoint of the set, but that point is not included)

debbieg · Answer

Right - it's one of those. :) Now what does the arrow going left mean?

anonymous · Answer

its less than

anonymous · Answer

so B...Xp

debbieg · Answer

There ya go. :) See, you knew how to do it all along. :)