If an ionic compound has 10 cations and 20 anions, whats the ratio

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at