Kate is allowed to work no more than 20 hours a week. she has already has worked 13 hours this week. at most, how many more hours can she work ? write an inequality and solve

Simple answer? 7
<= is the sign of less than or equal to
>= is the sign of greaten than or equal to
13=<x<= 20

PS the question doesnt make much sense to me. As a general rule in maths, if it seems to easy you are doing wrong :p 

Which of the following values are in the range is the function graphed below? check all that applya.3b.1c.0d.-2e.5f.2a