What is the equation of a line that has a slope of -3 and passes through (-2,6)

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?