Question 175515
We can write the equation like this: 
D = 1.2(sqrt{h}) 
Divide both sides by 1.2 to isolate the radical. 
D/1.2 = sqrt{h} 
We now square both sides to remove the radical. 
(D/1.2) = [sqrt{h}]^2 
(D^2)/(1.44) = h 
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? Can you see Cheyenne, Wyoming (about 89 miles away)? 
For part b, let h = 14,255 and solve for D. 
 
D = 1.2(sqrt{14,255})

D = 143.27 feet

Now convert this into miles. If it comes out to be greater than 89 miles, then the person can see Cheyenne, Wyoming, otherwise not.