What is the sum of all charges in the formula for an ionic compound?

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

How have the greenhouse gasses increased from the year 2000 to 2018