Ablue whale makes a call underwater at the same time as an elephant calls on land. how long will it take each of these sounds to travel 3 km? show your work.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

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.