The angle of depression is
tan^-1 3/7 = 23.2 deg
For the series 3/2 + 3/4 + 3/8 + 3/16 + ...the sum will be calculated by the formula
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<h3>What is number series?</h3>
When the numbers are arranged in a series with some logic then it is called as the number series.
here we have a series:

The sum of the series will be given as:


Hence for the series 3/2 + 3/4 + 3/8 + 3/16 + ...the sum will be calculated by the formula 
To know more about number series follow
brainly.com/question/6561461
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If you're trying to get x your answer would be -21.