I NEED THE ANSWER ASAP! IT'S DUE TOMORROW!! :(

What does this mean?

6 minutes < / ≤ 7 minutes

(I'm working with a step graph about the length and costs of phone calls, BTW)


Here's a question for it:

Find the charge for any phone call with the length (/) that has the following values: 6 minutes < / ≤ 7 minutes.