Please help I need to know ASAP I’ll give 50 points and brainliest to everyone The elevation of Charleston SC is about 20 feet above sea level. Select all of the elevations that are lower than the Charleston’s elevation.

I’ll give brainliest

0 feet

27 feet

105 feet

-3 feet

-12 feet

The maximum distance (in nautical miles) that a radio transmitter signal can be sent is represented by the expression 1.23h√, where h is the height (in feet) above the transmitter. estimate the maximum distance x (in nautical miles) between the plane that is receiving the signal and the transmitter. round your answer to the nearest tenth.