Water at the top of a hill as potential energy. Where and how does the water get it's potential energy?

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical