In the early spring, the trout at Big Blue Lake swim at a depth of 30 feet below sea level. When the lake warms up in the summer, the trout swim 20 feet deeper than that.
At what position relative to sea level do the trout swim in the summer?

Given :

In the early spring, the trout at Big Blue Lake swim at a depth of 30 feet below sea level.

When the lake warms up in the summer, the trout swim 20 feet deeper than that , d = 20 feet .

To Find :

At what position relative to sea level do the trout swim in the summer.

Solution :

Depth in spring from surface , .

Let , depth in summer is D .

Now , depth in summer relative to sea-level is :

Therefore , trout swim 50 feet deep below the sea level in the summer .

Hence , this is the required solution .

okay wait before i answer, is this for your points on a graph?