At​ noon, a tank contained 8 cm of water. After several​ hours, it contained 6 cm of water. What is the percent decrease of water in the​ tank?

50%

Step-by-step explanation:

The water decreased by 50% because the water started at 8 cm and went down to 4 cm. Half of 8 is 4, or if you multiply 8 by .5, or 50%, you get 4.

22 and 22

step-by-step explanation:

10 plus 12 equals 22.

12 plus 10 also equals 22 because regardless of what order they're in, they're gonna equal the same thing.