What is the value of matrix b if a + b = c

Solve for x by completing the square. 2x^2-4x+7=0

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

Select all of the quadrants that the parabola whose equation is y=√x-4 (principal square root) occupies. i ii iii iv