Y=x+4 how to solve i need the know plaese

you can't solve that, you need more information in that equations like and x or an y.

Otherwise, the equation stays like that.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

- decrease the number of plants and animals living in the water.