In the standard (4) coordinate plane, the coordinates of the midpoint of ab are (6,8) and the coordinates of a are
(3,2). what are the coordinates of b ?
a. (0,-4)
b.(3,6)
c.(9/2,5)
d. (9,14)
,-6)

Can someone me and do the problem plz so i can understand it more better

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

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?