Starting at sea level, a submarine descended at a constant rate to a depth of −56 mile relative to sea level in 4 minutes. what was the submarine's depth relative to sea level after the first minute? enter your answer in the box as a fraction in simplest form.

divide total depth by time:

-56 /4 =14

 so it is diving at 14 miles per minute

 so after the first minute it was at -14 miles

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.