What is velocity and what do you mean by gravity

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87