alex is driving across the country. he needs to drive 10 hours a day for 11 days

Step-by-step explanation:

It's asking how many hours are left after 75 is done.  Well, we need to know how many it started with.  We know it was 10 hours a day for 11 days, well how many hours is that?

If you need to you can just count it up.  1 day would be 10 hours, 2 days would be 20 hours  and so on, that leaves us with 110 hours.  

Now, if 75 are already passed, that leaves 110-75 = 35

Let me know if there was anything you didn't understand.  

I will go check

Step-by-step explanation:

:))