Question 843004
5 - x <= 0


5 - x + x <= 0 + x


5 + 0 <= x


5 <= x


x >= 5


So the answer is <font color="red">[5, infinity)</font> which is <font color="red">choice A</font>


Note: if you can't write out the infinity sign, then you simply just write "infinity"


Here's what the answer would look like if you could write out the symbol itself


<img src="http://quicklatex.com/cache3/ql_1a0bc780e77e0621fb6c91ec631f44b0_l3.png">


Notice how the square bracket is used on the 5 because we're including x = 5 in the solution set.