Question

Graph -1/4t is more than or equal to 9. Does the solution set get ( or [

Answer 1

-1/4t >= 9 -- multiply by 4
-t >= 36
t <= - 36

or

-1/4t >= 9 (divide both sides by -1/4)
t <= 9/(-1/4)
t <= 9 * -4/1
t <= - 36

no ( or [ is needed

Answer 2

\[\frac{-1}{4}t \ge9\]\[\frac{1}{4}t \le-9\]\[t \le-36\]\[(-\infty ,-36]\]