Lake Profound has a depth of 84 feet. Lake Segundo is 5/6 as deep. What is the elevation at the bottom of Lake Segundo? (remember, the elevation is below sea level. Account for this in your answer.)

Lake Segundo is 5/6 * 84 feet = <<5/6*84=70>>70 feet deep.

The elevation at the bottom of Lake Segundo is 0 - 70 feet = <<0-70=-70>>-70 feet below sea level. Answer: \boxed{-70}.

To find the depth of Lake Segundo, you can multiply the depth of Lake Profound by 5/6:

Depth of Lake Segundo = (5/6) * Depth of Lake Profound

Depth of Lake Segundo = (5/6) * 84 feet

Depth of Lake Segundo = 70 feet

However, since the elevation is below sea level, we need to account for this. We can assume sea level is 0 feet.

Elevation at the bottom of Lake Segundo = 0 - Depth of Lake Segundo

Elevation at the bottom of Lake Segundo = 0 - 70 feet

Elevation at the bottom of Lake Segundo = -70 feet

Therefore, the elevation at the bottom of Lake Segundo is -70 feet below sea level.

To find the depth of Lake Segundo, we can start by determining how deep it is compared to Lake Profound. We know that Lake Segundo is 5/6 as deep as Lake Profound.

Depth of Lake Segundo = (5/6) * Depth of Lake Profound

Since the depth of Lake Profound is given as 84 feet, we can substitute this value into the equation:

Depth of Lake Segundo = (5/6) * 84

Now, let's calculate this:

Depth of Lake Segundo = (5/6) * 84 = 70 feet

So, the depth of Lake Segundo is 70 feet.

However, the question asks for the elevation at the bottom of Lake Segundo, accounting for the fact that the elevation is below sea level. In this case, if the depth is given as a positive value, it means that the bottom is below sea level. Therefore, the elevation at the bottom of Lake Segundo is -70 feet (negative due to being below sea level).