A dolphin went 15 feet below sea level to catch a fish. A shark went twice as deep, then swam down an additional 10 feet to catch a larger fish. Which expression represents the shark’s position in relation to sea level?
1. 2(-15) + (-10)
2. 2(-15) + 10
3. 2(-15) - (-10)
4. 2(15) + (-10)