Question 175540
2. The equation [D=1.2 square root of h] gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. 
a. Solve this equation for h. 
{{{D = 1.2sqrt(h)}}}
{{{D^2 = 1.44h}}}
{{{h = D^2/1.44}}}
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b. Long’s Peak in the Rocky Mountain National Park, is 14,255 feet in elevation. How far can you see to the horizon from the top of Long’s Peak? 
{{{D = 1.2sqrt(h)}}}
{{{D = 1.2sqrt(14255)}}}
{{{D = 1.2*119.39}}}
{{{D = 143.27 miles}}}
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Can you see Cheyenne, Wyoming (about 89 miles away)?
Cheyenne is less than 143 miles, so yes, but whether you can see it or not depends on atmospheric conditions (weather, haze, etc.).  
Actually, it's below the horizon.  This formula gives the distance to the horizon.