Why can’t astronomers take a picture of a black hole?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.