Answer: The answer is 5.
Step-by-step explanation:
You first set up the equation
10 + 7x = 45
You must put x because you don't know the number of hours he stays
You then subtract 10 from both sides of the numbers 10 and 45
That'll get you 7x = 35
To find out what x is you divide both sides by 7
7x divided by 7 is x
35 divided by 7 is 5
X = 5