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}

Answer 1

A??

Answer 2

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

Answer 3

greater than or equal to is closed rite?

Answer 4

Right. the endpoint is included in the set.

Answer 5

so its either b or d rite

Answer 6

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

Answer 7

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

Answer 8

its less than

Answer 9

so B...Xp

Answer 10

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