Explain in details what a matter is...!!!

What does x represent in the formula for the compound xcl4?

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?

Aman applies a force of 500n to push a truck 100m down the street how much does he do?