30cm³ of brine of relative density 1.15 and 42cm³ of water are mixed. What is the density of the final solution​

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem