x 2 sum - The total of each value in the x column squared and then added together. y 2 sum - The total of each value in the y column squared and then added together. N - The total number of elements (or trials in your experiment).
Patients with tuberculosis of the lungs have a prolonged illness with fever, cough, night-sweats, weight loss and may occasionally cough up blood. As the disease progresses, symptoms get worse and shortness of breath ensues. Untreated disease can be fatal.
Mold and mildew can make you and your family sick. 1  The steps that need to be taken to prevent mold and mildew in your home are well worth it. Mold (and mildew which is a type of mold) are very dangerous in many ways. 2  They are also often smelly and usually unsightly.