Afish dives into a depth of -3/4 mile below the surface of the water. a turtle's depth is 1/3 as deep as the fish's depth. what is the turtle's depth?

For this case, what we must do is multiply the depth of the fish by the fraction of depth of the turtle.
 We have then:
 (-3/4) * (1/3) = (- 3 * 1) / (4 * 3) = - 1/4 mile
 Therefore, the depth of the turtle on the surface of the water is:
 -1/4 mile
 
 the turtle's depth is:
 -1/4 mile