Need ASAP

Evaluate h^-2 g for h = 3 and g = 27.

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The area of a circle is equal to 1 dm². find the radius of the circle.

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.

Use the balanced scale to find the number of grams in 17 kilograms.