Answer:
He can clean 10 pools in 25 hours.
Step-by-step explanation:
-2x-4 > 8
-2x > 12
x < -6
Wait, what? Why did I reverse the direction of the greater than sign to a less than sign? Well, when you divide a negative number in an inequality problem, you need to reverse the sign. I hope the actual solving is obvious. If it's not, just ask for clarification!