How do you do this question?

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

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if