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 heart disease. Coronary heart disease (CHD) is the leading cause of heart attacks. CHD is a condition in which the coronary arteries (the major blood vessels that supply the heart with blood) get clogged up with deposits of cholesterol. These deposits are called plaques.
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.