Given 2 points on a coordinate plane 3(8) and (-5,2) what would be the midpoint

What is the volume of the sphere shown below with a radius of 3?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?