alex is driving across the country. he needs to drive 10 hours a day for 11 days in order to get to his
destination. so far, he has driven 75 hours. how many more hours of driving does alex have?

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.  

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.