The expression 2x+50 represents the elevation above sea level, in meters, of a rock climber after x minutes of climbing.
which is the rock climbers initial height above sea level?
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The rock climbers initial height above sea level is:

                                 50 meters.

The expression which is used to represent the elevation above sea level, in meters, of a rock climber after x minutes of climbing is given by:

                                     2x+50

Now, we are asked to find the rock climbers initial height above sea level i.e. we are asked to find the value of the expression when x=0.

Hence, when x=0 we  have:

2x+50=2×0+50

          = 50

Hence, the answer is: 50 meters.