Winter break packets are the worst : /

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

What is the simplified form of square root of 400 to the 100th power ?

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.