Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway.
Coronary artery disease. The most common underlying cause of heart attack is atherosclerosis, a condition in which a fatty substance called plaque builds up on the inside walls of blood vessels. When this occurs in the coronary arteries, it's known as coronary artery disease (CAD).
Heart attack (myocardial infarction (MI), is the leading cause of death among Americans. It often results from coronary artery disease, the most common form of heart disease to affect adults. See your doctor immediately if you feel pressure or a squeezing sensation in your chest, neck, jaw, shoulders, back or arms, especially if itâs accompanied by sweating, nausea, vomiting, or shortness of breath.