After swimming to a depth of 50 feet below the surface of the water , a fish swims back up 30 feet. Use a number line to help you create an equation that shows the new location of the fish in relation to the water's surface . interpret the sum the context of the problem. A. The equation is - 50 + (- 30) = - 80 . The fish 80 feet below the surface B. The equation is - 50 + 30 = - 20 . is 20 feet below the water's sunface The equation is - 50 + 30 = - 80 The fish is 80 feet below the water's surface OThe equation is - 50 + (- 30) = - 20 . The lish 20 feet below the water's surface