The surface area of a sphere can be approximated as follows: surface area = 4πr2; where r is the radius of the sphere; π is a constant that is roughly equal to 3. using the simple approximation above, calculate the surface area of a sphere with a radius of 5 meters.

your answer is rna to the question.

energy and particles

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.