Question 592130
Because of Earth's curvature, a person can see a limited distance to the horizon.
 The higher the location of a person, the farther that person can see.
 The distance D in miles to the horizon can be estimated by D(h) = 1.22√h, where h is the height of the person above the ground in feet.
 How high does a person need to be to see 23 miles?
:
{{{1.22sqrt(h)}}} = 23
;
{{{sqrt(h)}}} = {{{23/1.22}}}
Square both sides
h = 355.4 ft