7 Hours. 315 divided by 45 equals 7.
Answer:

Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.
There would be four sides, three around and the bottom base <span />
Ming needs to play for 15 hours to get 500 points. They gave him 200 for signing up, so 500-200=300 more points needed. 300 divided by 20= 15 more hours.
A fish is 12 Meters below the surface of the ocean. What is the elevation it is -12