Step 1a

Mark initially added 37 liters of water.

To convert 14,550 milliliters to liters, divide by 1000:

\$(14,550 ml) / 1000 \$ = 14.55 liters

Explanation: Here, we converted milliliters to liters which is 14.55 liters.

Step 1b

Now, add the two volumes together:

37 liters (initially added) + 14.55 liters (additional) = 51.55 liters

So, Mark has added a total of 51.55 liters of water to the swimming pool.

Explanation: The total volume of water added into the swimming pool is 51.55 liters.