A sphere has a diameter of 10 in. what is the volume of the sphere?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?