Joe is hiking in national park wilderness. his radio transmits signals as far as the horizon. use the formula d =square root/1.5h , where d is the line-of-sight distance to the horizon in miles and h is height in feet.
joe sets his receiver on the ground. what is the farthest away that a transmitter 4 ft above the ground can be in order to reach joe?

a.
0 mi
c.
2.4 mi
b.
1.2 mi
d.
6 mi