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2.)
<em>Hope it helps and is useful :)</em>
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2 answers:
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The general form of recursive definition for arithmetic sequence:
So, what we need to do is to find
and 
.
Having found these two values we can now define our recursive sequence:
So, what we need to do is to find
Having found these two values we can now define our recursive sequence:
Notice the picture below
so.... the angle of depression, is above in dashed lines.... however, the angle of depression, is identical to the angle of elevation from the water, since, both angles are "alternate interior" angles
now, using the 45-45-90 rule, then we know the swimmer is 90 feet from the lighthouse, then just use the tangent ratio to get "x"
so.... the angle of depression, is above in dashed lines.... however, the angle of depression, is identical to the angle of elevation from the water, since, both angles are "alternate interior" angles
now, using the 45-45-90 rule, then we know the swimmer is 90 feet from the lighthouse, then just use the tangent ratio to get "x"